NRS Convertible Oar Right Molded, glass fill nylon construction for years of trouble free service Use with Carlisle or Cataract oars with an oar sleeve (sold separately) Clamps securely to molded oar sleeve Spline moves up to allow feathering fits Cataract factory rope wrap Adjusts from 2 to 2 1/4 inches, Collar 3 7/8 in diameter, 1.05 lbs. per pair