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.