For use in Spring, Gas and Electric airsoft guns – 6mm biodegradable airsoft BBs High Polished – 0.20 grams – 2700 rounds – White – 100% eco-friendly, biodegradable resin 5.930mm +/- 0.025mm dia., 5.928mm – mean dia. 5.907mm – min. dia., 5.947mm – max. dia – Takes approx. 11 months to degrade when exposed to the elements (rain, snow, etc.) For precision airsoft use – Made to exacting standards using high-quality materials. Bio-resin research conducted by a research lab in Holland, and manufactured on the most advanced equipment in Seoul, South Korea.