GBR-55 Bumper, Free Height: 2.20 in./55.9 mm Width: 1.80 in./45.7 mm Peak Force: 1,050 lbs./4,700 N – GBR-55 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. These bumpers are ideal for applications that require longer travel and softer entry.