I bought these beads for my small watercolor and tattoo ink bottles and added one to each bottle (after sterilizing with isopropyl alcohol). They make shaking the ink a lot faster! And best of all, they're made of stainless steel, so they won't corrode or react with ink (you don't want rust in your bloodstream!).
Bearing 608- ZZ1MC3E (8x22x7) NSK//80018
4 Review
Linear Clamping Support Bearing by Sydien
4 Review
Enhanced Performance Sydien SCS12UU Bearing Bushing Diameter for Precision Machinery
4 Review
π Wheels Manufacturing Ball Retainer Bag: Convenient Storage and Protection for Your Ball Retainers
6 Review