PURPOSE: To permit the appearance of luster by slightly cutting the adhering contamination without damaging the surface of a ball for ball playing game, etc., by adding cerium oxide and electrification preventing agent into a polishing material.

CONSTITUTION: A nylon pellet is added with the cerium oxide fine powder and an electrification preventing agent in 0.5W20% by weight, and a desired polishing material is obtained. The contamination on the surface of a ball for ball playing game is slightly cut by the added cerium oxide, and the adhering contamination is removed, and luster is allowed to appear, removing rust. Further, the electrification by static electricity on the ball for ball playing game is prevented by the electrification preventing agent.