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The idea behind a silicone insert is that foam inserts couldn't hold the weight of increasingly heav...Read More

The idea behind a silicone insert is that foam inserts couldn't hold the weight of increasingly heavier trucks with smaller tires. Rock Monster silicone inserts are the first legitimate solution to get more performance out of our ultra-scale trucks. Designed initially in Arizona U.S.A, Rock Monster silicone inserts hold the heavier rigs' weight, are waterproof, and long-lasting.