Manufactured by Scatterplot, these sorbothane pads are designed to cushion the impact between the piston head and cylinder head inside of the gearbox. The added cushion reduces wear and tear of repeated impact that can lead to the gearbox cracking. Additionally, sorbothane pads can be used to correct angle of engagement between the sector gear and first tooth of the piston greatly prolonging the life of gearbox internals. Professional installation of this product is highly recommended. Airsoft Station offers installation of most parts by professional airsmith technicians. For inquiries regarding installation of replacement and upgrade parts as well as other airsoft services please contact the Airsoft Station Tech Department here.