The Bio BBs from Tokyo Marui, the 0.25g Superior Perfect Hit Bio BBs can be ordered right now at MoaiHobby... "These Bio BBs are UV and temperature degradable materials. Unlike PLA and starch-derivative BBs, the P-Life BBs will be degraded in natural environments. They are precisely made at 5.95mm Diameter (Tolerance ±0.01mm) with the quality of BB is important for prolonging the life of your airsoft gun and a Tokyo Marui Japan Grade BB is guaranteed for quality."