Item Type: RV Jack Pad Material: Polypropylene Function: Leveling jack to prevent the vehicle from sinking Application: Cars, caravans, campers, trailers, etc. Package List 4 x RV Jack Pad 1Prevent Sinking Or Cracking: Stabilizer jack pads that prevent fifth wheel stabilizers, swing stabilizers, jacks from cracking or sinking into soft ground are designed with reinforced construction. 2Nonslip: The smooth part of the jack has four nonslip mats that can be used on flat or muddy roads for stability. For better results, it can be used with an aluminum or a plastic stabilizer jack stand. 3Stackable: The kit contains 4 stabilizer jack pads, 5.6x5.6in/14.4x14.4cm, and the stabilizer pads are also stackable if you need extra height, eliminating the need for bulky wood or cinder blocks. 4Easy to Carry: The jack pad is lightweight and has a built in handle for easy use on uneven surfaces such as gravel, roots, and comes with straps for easy storage. 5Anti UV and Weatherproof: The jack pad is made of Polypropylene materials, which are durable, anti ultraviolet and weatherproof, with long use life although exposed to sunlight or rain for a long time.