... φ15,φ20,φ25,φ28,φ30,φ35,φ40,φ455. Usage: Used in medicine, mineral, machinery, food, metal metallurgy, vibrating ... without side effects and other characteristics, so often used in environmental protection requirement high industry.7. Sample: ... workers;3.Good entertainment center and accommodation for workersSilicone Rubber Products producing process: Food grade white silicon gel ball for industrial