This Tentacle System component grips a figurine for painting. You can use any tentacle base, but the Pill Bottle Weighted Base is great for painting figurines.

A 7/8" or 22mm O-ring in the groove around the bottom makes it easier to use, but it is optional. The grip works without an O-ring.

You can learn all about the Tentacle System here: https://3ddoodle.com/tentacle-system/