Bright green glow when used with tracer units or tracer mags ECO BBs manufactured in Taiwan Premium precision grade with multistage polishing Seamless, perfectly spherical construction Made from PLA bioplastic (compostable, renewable, ecofriendly) Works with all tracer units Smooth feeding in AEGs, GBB pistols/rifles, HPA systems, and precision barrels Tight tolerance: 5.95mm 0.01mm BB Weight 20g Packaged Qty 5,000ct Color: Glow-in-the-Dark Green Tracer