RWO's Medium Bridge Fairlead is made out of hard-wearing, black Acetal resin and has rounded edges to minimize friction and line abrasion while redirecting line. It has a 5/16 in. (8mm) aperture and measures 9/16 in. high x 1 1/4 in. long x 7/16 in. wide (14mm x 32mm x 11mm).