Marks left on the surface of the cloth that are usually white in color are referred to as ball burns. Simonis' high wool content helps to reduce the appearance of these marks, and we also recommend using phenolic balls to further reduce the appearance of ball burns. Ball burns from polyester balls are actually marks left on the cloth from degradation of the surface of the ball itself. Phenolic balls are much harder and are more resistant to heat than polyester balls. As always, the cloth and the balls should be clean. Any residue that has built up on the ball will leave marks on the cloth. Simple maintenance will prolong the life of your cloth, the aesthetic appearance of your table and your enjoyment of your game!