| 摘要 |
A substantially spherical hollow body having a diameter of 37 mm to 45 mm, in particular having a diameter of 39.7 mm to 40.75 mm, and a weight of 2.5 g to 3.5 g, in particular having a weight of 2.6 g to 2.85 g, having a shell and an inner hollow space, the shell having a wall thickness of 0.2 mm to 1.3 mm, in particular of 0.3 mm to 0.8 mm, characterized in that the shell is celluloid-free and has at least one styrene-containing copolymer. |
