Post Guide-On Covers protects the boat finish from scuffs. They are sized for a close fit on standard 2 schedule 40 PVC posts (2-3/8 actual outer diameter). Covers are made from strong polyurethane coated 600D nylon fabric with nylon closures on each end. Open bottom and top to allow for LED guide on lamps. 1/2 thick closed cell polyurethance foam inner pad.