Dual durometer grip with a glass filled Polypropylene under mold and a high grade TPE overmold TPE gasket to keep water out of the oar shaft Bi-directional groves in the cylinder for better adhesion to the oar shaft Clocking/indexing marks for fine tuning the installation for your rowing style Right and left handed marks on each grip for easy identification Texture surface of the TPE for a no slip high performance feel Diameter: 1 5/8" (Fits Sawyer standard diameter composite oars) Material: Glass-filled polypropylene undermold with a 2mm thick textured non-slip TPE overmold. Sold in pairs. One right and one left. Gilman Grips Oar Handles deliver a significant performance advantage by eliminating unintentional spin in your hand. This is accomplished by utilizing the most ergonomic shape and by providing your hand with twice the surface area, where you need it most. This grip design requires a fraction of the hand strength required to hang onto and properly control a traditional oar grip—resulting in less shoulder, wrist, and hand fatigue so that you can enjoy more glorious days on the river.