diff --git a/src/_core/src/pybind.cpp b/src/_core/src/pybind.cpp
index 3d1dafa..96501f5 100644
--- a/src/_core/src/pybind.cpp
+++ b/src/_core/src/pybind.cpp
@@ -90,8 +90,23 @@ PYBIND11_MODULE(_core, m) {
                                    "BitInFormat",
                                    R"pbdoc(The BitInFormat class specifies an extractable archive format.)pbdoc")
         .def("value", &bit7z::BitInFormat::value, py::doc(R"pbdoc(the value of the format in the 7z SDK.)pbdoc"))
-        .def("__eq__", &bit7z::BitInFormat::operator==)
-        .def("__ne__", &bit7z::BitInFormat::operator!=);
+        .def("__hash__", [](const bit7z::BitInFormat &self) { return std::hash<int>()(self.value()); })
+        .def(
+            "__eq__",
+            [](const bit7z::BitInFormat &self, const py::object &other) {
+                if (py::isinstance<bit7z::BitInFormat>(other))
+                    return self == *py::cast<bit7z::BitInFormat *>(other);
+                return false;
+            },
+            py::is_operator())
+        .def(
+            "__ne__",
+            [](const bit7z::BitInFormat &self, const py::object &other) {
+                if (py::isinstance<bit7z::BitInFormat>(other))
+                    return self != *py::cast<bit7z::BitInFormat *>(other);
+                return false;
+            },
+            py::is_operator());
 
     // bit7z::BitInOutFormat class bindings
     py::class_<bit7z::BitInOutFormat, bit7z::BitInFormat>(
@@ -329,7 +344,11 @@ PYBIND11_MODULE(_core, m) {
         "BitGenericItem",
 
         R"pbdoc(The BitGenericItem interface class represents a generic item (either inside or outside an archive).)pbdoc")
-        .def("is_dir", &bit7z::BitGenericItem::isDir)
+        .def(
+            "is_dir",
+            &bit7z::BitGenericItem::isDir,
+            py::doc(
+                R"pbdoc(true if and only if the item is a directory (i.e., it has the property BitProperty::IsDir))pbdoc"))
         .def("size", &bit7z::BitGenericItem::size, py::doc(R"pbdoc(the uncompressed size of the item.)pbdoc"))
         .def(
             "name",
@@ -370,9 +389,41 @@ PYBIND11_MODULE(_core, m) {
         m,
         "BitArchiveItemOffset",
         R"pbdoc(The BitArchiveItemOffset class represents an archived item but doesn't store its properties.)pbdoc")
-        .def("__eq__", &bit7z::BitArchiveItemOffset::operator==)
-        .def("__ne__", &bit7z::BitArchiveItemOffset::operator!=)
-        .def("__iadd__", [](bit7z::BitArchiveItemOffset &self, int val) { return self.operator++(val); })
+        .def(
+            "__eq__",
+            [](const bit7z::BitArchiveItemOffset &self, py::object other) {
+                if (py::isinstance<bit7z::BitArchiveItemOffset>(other))
+                    return self == *py::cast<bit7z::BitArchiveItemOffset *>(other);
+                return false;
+            },
+            py::arg("other"),
+            py::is_operator())
+        .def("__hash__",
+             [](const bit7z::BitArchiveItemOffset &self) {
+                 return std::hash<uint32_t>()(self.index()) ^ (std::hash<bool>()(self.isDir()) << 1)
+                        ^ (std::hash<uint64_t>()(self.size()) << 2) ^ (std::hash<uint64_t>()(self.packSize()) << 3)
+                        ^ (std::hash<uint32_t>()(self.crc()) << 4)
+                        ^ (std::hash<int64_t>()(self.creationTime().time_since_epoch().count()) << 5)
+                        ^ (std::hash<int64_t>()(self.lastAccessTime().time_since_epoch().count()) << 6)
+                        ^ (std::hash<int64_t>()(self.lastWriteTime().time_since_epoch().count()) << 7)
+                        ^ (std::hash<uint32_t>()(self.attributes()) << 8) ^ (std::hash<std::string>()(self.path()) << 9)
+                        ^ (std::hash<std::string>()(self.name()) << 10)
+                        ^ (std::hash<std::string>()(self.extension()) << 11)
+                        ^ (std::hash<std::string>()(bit7z::to_tstring(self.nativePath())) << 12);
+             })
+        .def(
+            "__ne__",
+            [](const bit7z::BitArchiveItemOffset &self, py::object other) {
+                if (py::isinstance<bit7z::BitArchiveItemOffset>(other))
+                    return self != *py::cast<bit7z::BitArchiveItemOffset *>(other);
+                return false;
+            },
+            py::arg("other"),
+            py::is_operator())
+        .def(
+            "__iadd__",
+            [](bit7z::BitArchiveItemOffset &self, int val) { return self.operator++(val); },
+            py::is_operator())
         .def("item_property",
              &bit7z::BitArchiveItemOffset::itemProperty,
              py::doc(R"pbdoc(Gets the specified item property.
diff --git a/src/pybit7z/_core.pyi b/src/pybit7z/_core.pyi
index 5c15c39..0a708d4 100644
--- a/src/pybit7z/_core.pyi
+++ b/src/pybit7z/_core.pyi
@@ -669,8 +669,10 @@ class BitArchiveItemOffset(BitArchiveItem):
     """
     The BitArchiveItemOffset class represents an archived item but doesn't store its properties.
     """
-
+    def __eq__(self, other: typing.Any) -> bool: ...
+    def __hash__(self) -> int: ...
     def __iadd__(self, arg0: int) -> BitArchiveItemOffset: ...
+    def __ne__(self, other: typing.Any) -> bool: ...
     def item_property(self, arg0: BitProperty) -> BitPropVariant:
         """
         Gets the specified item property.
@@ -992,7 +994,10 @@ class BitGenericItem:
         """
         the item attributes.
         """
-    def is_dir(self) -> bool: ...
+    def is_dir(self) -> bool:
+        """
+        true if and only if the item is a directory (i.e., it has the property BitProperty::IsDir)
+        """
     def name(self) -> str:
         """
         the name of the item, if available or inferable from the path, or an empty string otherwise.
@@ -1010,7 +1015,9 @@ class BitInFormat:
     """
     The BitInFormat class specifies an extractable archive format.
     """
-
+    def __eq__(self, arg0: typing.Any) -> bool: ...
+    def __hash__(self) -> int: ...
+    def __ne__(self, arg0: typing.Any) -> bool: ...
     def value(self) -> int:
         """
         the value of the format in the 7z SDK.
diff --git a/tests/test_bit7z.py b/tests/test_bit7z.py
index ddd6adc..81135f3 100644
--- a/tests/test_bit7z.py
+++ b/tests/test_bit7z.py
@@ -38,6 +38,18 @@ def large_file(temp_dir):
     return file_path
 
 
+def test_format():
+    """Test format from bit7z"""
+    assert core.FormatSevenZip.extension().endswith(".7z")
+    assert core.FormatSevenZip != core.FormatZip
+    assert core.FormatSevenZip == core.FormatSevenZip
+    assert core.FormatSevenZip.has_feature(core.FormatFeatures.CompressionLevel)
+    assert core.FormatSevenZip.has_feature(core.FormatFeatures.Encryption)
+    assert core.FormatSevenZip.has_feature(core.FormatFeatures.MultipleFiles)
+    assert core.FormatSevenZip.has_feature(core.FormatFeatures.HeaderEncryption)
+    assert core.FormatSevenZip.has_feature(core.FormatFeatures.SolidArchive)
+
+
 def test_format_features():
     """Test format features detection"""
     fmt_7z = core.FormatSevenZip