Docking can be treacherous – it's a minefield of corners and edges that can cause damage. Protect your dock and boat with dock bumpers. These bumpers are constructed from a closed cell foam padding that won't deflate or collapse and are designed with four grommets for secure mounting. UV and tear resistant with a marine-grade tri-laminate cover, double thermal-bonded seams, and corrosion-proof polycarbonate grommets. Dimensions: 12†long (each side) x 6†tall x 4†thick. Two-year replacement .