The McLellan Perma-Slat is made of tough, 80-durometer rubber, 7/8” thick and permanently vulcanized to a 1/8” mild steel base. Each 30” unit (for shipping convenience) weighs 6 lbs. each, and can easily be skip welded or bolted to the sub-frame of the body being mounted. Once in place, these durable Perma-Slats virtually never need replacing, unlike the wood boards that become crushed and compacted over time or rubber belts that slip and fail. The product’s permanent life cycle saves thousands of dollars from rework and damage during the life of your truck.