The Lancer Tactical Biodegradable Tracer BBs are designed for use with tracer units to enhance your airsoft gameplay. These 0.20g BBs have built-in tracer technology, allowing them to illuminate in low-light conditions when used with a compatible tracer unit. The package includes 2000 rounds of BBs, providing you with a good quantity for extended gameplay. The BBs are biodegradable, making them environmentally friendly and reducing their impact on the environment. They have a smooth surface for improved flight stability and reduced jamming. They are 6mm in diameter, which is the standard size for airsoft BBs. The green color of the BBs adds a visually striking element to your shots. These biodegradable tracer BBs from Lancer Tactical are an excellent choice for airsoft players who want to add an exciting tracer effect to their games while being conscious of the environment.