RZR Bio-BB's 3500 rounds 0.25g are 
high-quality, biodegradable airsoft pellets from Nuprol, known for their tight tolerances (±0.01mm) for better accuracy, suitable for most airsoft guns, offering a great balance of speed and range in a bulk, resealable 3500- bag, ideal for players needing reliable, eco-friendly ammo. 
Key Features:
Brand: Nuprol RZR.
Type: Biodegradable (Bio).
Weight: 0.25g (a popular mid-range weight).
Quantity: 3500 rounds in a resealable bottle.
Tolerance: Tight ±0.01mm, ensuring smooth feeding and accuracy, especially in tightbore barrels.
Material: Polymer, meeting ISO standards for biodegradability.
Colors: Available in various colors, including green (sometimes as tracers).