These Valken Field 0.25g biodegradable airsoft BBs are the perfect airsoft starter pack for rental guns, or new airsoft players. These6mm BBs from Taiwan are highly polished and seamless giving you greater accuracy and consistency, and they are packaged in a resealable bag making storage, transport, and loading simple and convenient. Our BIO BBs are made from PLA(PolyacticAcid), which is recyclable and compostable thermoplastic derived from a renewable, earth friendly resource, such as corn starch. We recommendusing our Valken airsoft BB Speed Loaders for use with Field BBs when loading mid-cap magazines.