RWO's 9/16 in. (14mm) Medium Black Bullseye with a stainless steel liner is one of a full line of bullseyes. It is molded from high load-bearing Acetal resin to provide maximum wear resistance. The stainless steel ferrule liner works ideally with high-tech line. Its aperture is 9/16 in. (14mm). It measures 1 3/4 in. x 7/32 in. x 1/2 in. (45mm x 22m x 13mm).