Vorsk 0.25g Biodegradable (Bio) BBs
 are precision-engineered 6mm airsoft rounds available in a 3,600-round bottle. These BBs are manufactured to high standards, often referred to as "Tier 1" performance, and are a sub-brand of Nuprol. 
Key Specifications
Weight: 0.25g per round, ideal for AEGs firing between 280 and 370 FPS.
Diameter: 5.95mm with a tight tolerance of ± 0.01mm to prevent feeding issues.
Finish: Triple-polished for enhanced flight stability and improved aerodynamics.
Biodegradability: Meets internationally recognized ISO 14855-1 standards; designed to break down in natural environments over time (typically 90–180 days).
Packaging: Comes in a large screw-top bottle that is foil-sealed at the factory to maintain freshness and prevent moisture absorption. 
Product Variants
Standard Bio: Standard white rounds for general outdoor skirmishing.
Tracer Bio: Green-tinted rounds infused with glowing materials for use with a tracer unit in low-light conditions.