Metal Marbles for the new Marble Machine

[BenBE]

A while back, Wintergartan – the ones behind the Marble Machine – set out to create a new version of their instrument. For this they ordered several shiny metal spheres, to test their utility for the kick drum.

https://www.youtube.com/watch?v=rVCF8wjwj2E&t=182s

At around the three minute mark there's about 20 seconds with a series of shots that have all 13 metal spheres aligned.