BCA Superior Heavy Airsoft Biodegradable BBs - 2000rd Bottles (0.36g to 0.45g)Specifications: 0. 36g 0. 40g 0. 43g 0. 45g 6mm (5. 95mm) Material: Biodegradable PLA 2000rd Bottles High Precision and consistency OEM'd by BLS and now in a convenient bottle format! Our BCA Superior BBs are made to the same outstanding quality and consistency as what you would expect from premium quality Taiwanese BBs, without any of the issues that arise from bags. That means no crushed BBs, no ripped bags, and no moisture that seeps through.