GBB Flat Hop Up Rubber 60°(4 pack)

“GBB” type, flat hopup rubber, 60°, pack of 4 Initially designed for the TAC-41 “GBB” hopup, this hopup rubber can fit inside most of airsoft guns using “GBB” hopup rubber. Transparent silicone for easier installation, light blue color, 60° hardness, 4 pieces