Biodegradable BBs are airsoft BBs made from biodegradable materials. Depending on the environment, biodegradable BBs will 90% biodegrade in around 6 months. BB weights ranges from .20, .25, .28, .30 gram BBs. and are as accurate as any good quality 6mm BB. They also come in different colors from white which is mostly used by airsoft players, tan (some fields requires tan bio bbs to blend in the dirt), and Green (mostly used in backyard shooting specifically in the lawn area to blend in the grass). We carry Bioval, G&G, Madbull, and Elite Force biodegradable BBs.