- Special glued pooled whalebone, which are used to rostřelování basic position in the pool - Material: Phenolic. The material used in the production company Aramith billiard balls best in the world - Whalebone used to hard and rychlím breaks and jump balls with jumps - Underwire has a curved shape in the shape of pocket billiard skin - Diameter 13 mm - An inner diameter of 8 mm