GBB Flat Hop Up Rubber 70º(4 Pack)

“GBB” type, flat hopup rubber, 70°, 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, yellow color, 70° hardness, 4 pieces.