Holt Allen's Bridge Fairlead is made out of hard-wearing, black/gray, Acetal resin and has rounded edges to minimize friction and line abrasion. It measures 1 1/16 in. high x 1 5/8 in. long x 9/16 in. wide (27mm x 42mm x 14mm). It has a 3/8 in. (9.5mm) aperture.