Rubber bushings can be used as shock absorbers, vibration insulators, abrasion resistors and as seals for wires, pipes, tubing, and rods. Rubber grommets are also an essential machine component. In general, they may be used to prevent wear and tear associated with the relative motion of an object passing through it. In addition to limiting wear, many grommets also serve as seals for wires, rods, and pipes that pass through bulkheads, firewalls, and plates.