Proxxon Flexible Fine Polishing Silicon Wheels & Bullets Proxxon Fine Polishing Wheels 28294 Plastic compound, used for surface smoothing and polishing of precious metals, non-ferrous metals, hardened metals as well as glass, porcelain, wood, rubber, plastic. Shaft 2.35mm. No 28294 Size 22 Pack of 10 Proxxon Fine Polishing Bullets 28288 Plastic compound, used for surface smoothing and polishing of precious metals, non-ferrous metals, hardened metals as well as glass, porcelain, wood, rubber, plastic. Shaft 2.35mm. No 28288 Size 5 Pack of 5