Made in Italy, the FPS Softair XPPE piston head is constructed from technopolymer reinforced with carbon fiber to offer lightweight performance with strength. Built on the "XP" (X-Ring) platform, it replaces traditional round cross-section O-rings with a specialized quad/X-ring seal to optimize air pressure retention while reducing drag against the cylinder wall. Features a 6-port pressure deviation head design to ensure rapid seal expansion on the forward stroke and integrated ball bearings to prevent spring twisting during rapid cycle rates. Fully compatible with standard AEG gearboxes.