Proven around the world, Carlisle's tough, maintenance-free, quality aluminum shafts give you maximum strength and performance. The 1-7/8" diameter thick-walled tempered aluminum tubing is sheathed in colorful, abrasion-resistant polyethylene tubing. 8' and longer oars have reinforced inner shafts for extra-duty strength. Rubber grips cushion the molded plastic handles. Removable blades permit easy storage and transport.