From BLS we have their Perfect High Precision range of Biodegradable BBs. Designed for precision, consistency and eco-friendliness these BBs deliver everything an airsoft player could want. With the highest tolerance currently available, they are 5.95mm ± 0.001 with a seamless high grade polished finish, so whether you are running a stock or high precision custom RIF, you will always get consistent results. BLS use a cornstarch-based PLA polymer for their biodegradable BBs enabling them to breakdown and decompose naturally over time.
 
Specification
BB Weight: 0.45g
Tolerance: 5.95mm ±0.001
Packaging: 1000 BB Resealable Bag