Extruded with flexible PVC material, designed to be used to trap air and act as an air cushion. Excellent for use on all docks. 3 x 8' sections totaling 24', easy to mount. 1-1/2" Protrusion (2-1/4" Overall w/top tab) x 2-5/8" overall height. Perfect for small outboards or personal watercraftContains molded-in UV inhibitors and fungicidesWill retain resiliency and brilliance for yearsUnaffected by oil, gas or saltwaterInstalls in minutes