The Leveling Block Non Slip Pad works well underneath Camco and FasTen brand leveling blocks, other brand leveling blocks, or on its own to help prevent jacks and stabilizers from sinking into soft ground. The flexible material is great for use on uneven surfaces such as gravel, tree roots and rough earth to help create a more even surface. It also helps prevent the leveling blocks from cracking due to uneven stress. Non Slip Pads are UV resistant, weather-proof, and constructed of recycled materials. 2 Pack.