The piston choices had been updated for perfect fit and dampening inside brand new big bore surprise systems. The 2-hole pistons (1.6 and 1.8mm) are a part of 2.0mm and 2.5mm depth options. Additionally, two sets of blank pistons both detailed alternatives are included for specific customized modification. All pistons are made of Delrin and therefore are additionally molded using ultra-high accuracy moulds.