What Are Airsoft BBs Made Of? A Simple Guide

Airsoft BB composition directly affects how they fly, how safe they are, and how they impact the environment.

The most common material is ABS plastic (Acrylonitrile Butadiene Styrene), a strong, smooth plastic that helps BBs travel accurately through a gun's barrel. Most BBs are 6 mm across and come in weights from about 0.12 g to 0.40 g — lighter BBs suit beginner spring pistols, while heavier BBs give better accuracy outdoors and in windy conditions. ABS plastic does not break down; it can stay in the environment for a very long time and may break into tiny plastic pieces (microplastics) that harm wildlife and water.

For that reason, many outdoor airsoft fields across Canada require biodegradable BBs. These are mainly made from polylactic acid (PLA), a plant-based material made from corn starch or sugarcane. Biodegradable BBs perform similarly in gameplay but will break down over time.

What Bio BBs Are Really Made Of

Most bio BBs are not pure PLA. They typically contain 50–70% polylactic acid mixed with mineral salt fillers. The fillers help reach the right weight and precision so the BBs fly consistently.

Gear Up Airsoft - Your Markham Destination for BBs and Gear

Ready to shop for quality airsoft BBs and gear? Whether you're after lightweight 0.20g rounds for beginner spring pistols, heavier 0.25g BBs for outdoor precision, or biodegradable options for Canadian fields, airsoft rifles in Markham and the full GearUp Airsoft store have you covered. Serving the Canadian airsoft community since 2013, GearUp Airsoft is located right in Markham on Kennedy Road and stocks only premium, high-tolerance BBs alongside top brands like VFC, KWA, and WE Tech. Don't let cheap BBs damage your gun — trust the experts who know the sport.