Finally, you can go green while maintaining accuracy and consistency in your Airsoft gun. Manufactured to exact dimensions within a +/-0.01mm tolerance. This environment-friendly BB will shoot tight groups at long distances. Nontoxic and safe for people and environment tested according to EU and US regulations. The BB's contain PLA, a thermoplastic polyester derived from renewable resources, such as corn starch, or sugarcane. PLA biodegrades in the presence of primarily moisture and oxygen.