The Accelerate BB’s are tested through several precision machines for weight and dimensions before the packaging process. Then go through random sampling by hand and measured again. Any BB’s not meeting standards are rejected. So you receive only the highest quality Accelerate BB’s. The Accelerate BB’s are sealed in roll-proof bottles in quantities of 2, 500 and 5, 000 count. The bottles can be resealed with color matching water proof caps for future use. ProMatch – made from high quality Acrylonitrile-Butadiene-Styrene (ABS) resin otherwise known as ABS, which reduces the occurrence of air pockets and deformation in order to maintain precision performance. BIO – made from Polyactic acid (PLA), which is a biodegradable thermoplastic aliphatic polyester derived from a renewable resource such as corn starch. BB’s made from PLA are an alternative to BB’s produced from petrochemical derived materials. TRACER - Specially designed BB's to be used in tandem with Tracer Units (Sold Separately).