3/4 in. (0.75) Black Phenolic Plastic Resin Balls | Precision Plastic Ball Company
Aka-Resin Phenolic-2, Black - AKASEL A/S
AYLIFU 28mm Black phenolic Resin Cap Polyethylene Sealed Spiral Cover is Suitable for Daily Chemicals, Food, Cosmetic Bottles and Industrial use (16-Pack): Amazon.com: Industrial & Scientific