GBA-S Bumper, Free Height: 2.58 in./65.5 mm Base Diameter: 2.33 in./59.2 mm Peak Force: 2,300 lbs./10,500 N – GBA-S bumpers are made from our proprietary TecsPak material. Tests have shown that TecsPak is 10 times more durable than rubber and 20 times more durable than urethane. GBA-S bumpers are inert and performance is not affected by dirt, oils and other chemicals. GBA-S bumpers are meant for medium load applications. Which makes them the ideal bumper for any application involving shock absorption or collision protection.