▎ 摘　　要

NOVELTY - Ball comprises a biodegradable polymer and one or more additives, such as an electrostatic charge eliminating additive, density increasing additive, and/or strength/hardness modifying additive added to the polymer mass during the compounding stage, where the ball is manufactured by a process suitable for the manufacture of polymers, such as injection molding, into a substantially spherical shape and grinding and/or polishing the ball to its final shape using double-sided lapping, barrel tumbling and/or the like, and the biodegradable polymer used in the ball is polybutylene succinate. USE - The ball is used as an airsoft ammunition, in bearing applications, and valves (all claimed). ADVANTAGE - The ball enables a ball made of biodegradable material, which is self-degradable under natural conditions.