High-quality polished precision bullets for sniper rifles and other tuned weapons using heavier bullets. The bullets come in bags of 1000 bullets, the color of the bullets is white. The manufacturing method of the bullets makes them tough and uniform, with extremely small variations between individual bullets. Bio-bullets are made from more environmentally friendly, biodegradable PLA bioplastic.

BLS is a private label brand of a Taiwan-based pellet manufacturing company. The company subcontracts a large portion of the world's airsoft pellets, which are then sold to customers under different brands (such as Madbull). BLS has been manufacturing airsoft pellets since 1991 and is one of the largest producers of airsoft pellets. Its advanced manufacturing processes enable the production of airsoft pellets from 0.12g to 0.50g.