The 
Nuprol RZR BIO Tracer Green 0.28g BBs are high-quality, biodegradable airsoft ammunition designed to glow when used with a tracer unit, making them ideal for low-light or nighttime play. They come in various quantities, including a 3500-round bottle and a 6000-round bag. 
Key Features
Weight: 0.28g, suitable for high-performance replicas and providing a balance of range and accuracy.
Type: Biodegradable (BIO) and Tracer (glow in the dark green). The bio-options meet the internationally recognized ISO standard for Controlled Aerobic Compositing (DIN EN 13432:2000 | ISO 14855-1:2012).
Quantity: Available in 3500 rounds (as requested) in a bottle, as well as 2200-round bottles and 6000-round bags.
Precision: Manufactured to tight tolerances of +/- 0.01 mm with a 5.95 mm diameter, ensuring consistent feeding and enhanced flight performance, especially in tightbore barrels.
Quality: They are triple-polished and undergo multiple quality control checks.