8mm 0.35g Marushin BIO 500 BBs.
These BBs are manufactured by Marushin in Japan. These high quality, high polish airsoft BBs are recommended for use with all appropriate high end spring and gas guns. At 0.35g, these BBs are in the middle of the road for choosing weight for 8mm BBs. The Biotech label is part of Marushin's biodegradable line of BBs. Airsoft players recommend this BB for use in the 8mm grenades, like the Mad Bull M781 and XM993 rounds. Because of the weight, this BB will produce a medium sized pattern at medium distances when used in a grenade launcher.

*For use with 8mm guns and grenades ONLY!