RZR Bio-BB's 6000 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 6000-round 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: 6000 rounds in a resealable bag.
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).