The hybrid construction of the Taylor Made Dock Cushion places soft compressible foam where you want it and tough high-density foam where you need it. The inner core is a lower density EVA foam, and the outer front and back pieces are a tougher, higher density polyethylene foam for superior cushioning from impact. The UV-protected material is maintaince-free and non-marring. Pre-drilled and ready to mount, this cushion comes with foam plugs that provide a clean, finished look. Hardware not included. 18" x 18"; 5"H x 3.25"D.