Soldier Arthas-38 does a review of biodegradable BBs for airsoft use... "This analysis provides detailed information on key characteristics of biodegradable airsoft BBs. The gram weight ranges from 0.20g to 0.45g, catering to different gameplay styles and weapon types. With a standard diameter of 6mm, these BBs are compatible with most airsoft replicas available in the market. The balanced weight ensures optimal precision and range during gameplay. While some BBs may have small surface bubbles, they have negligible impact on performance. This comprehensive overview enables players to make informed decisions, promoting environmental sustainability while enjoying the game."