The Raptors Airsoft Aluminum Ball Bearing Piston Head is a precision-machined upgrade component that can help improve the performance of your airsoft gun. It is made from high-quality aluminum and features a ball bearing design that reduces friction and wear on your gearbox. This piston head is compatible with most airsoft guns that use standard AEG gearboxes, and it can help increase your gun's velocity, accuracy, and overall performance.