Assumed to be New-Old-Stock, but could be used. Please expect some minor cosmetic issues.
Convert your single blade SUP paddle into a double blade kayak paddle. The two velcro straps attach to the shaft and the handle of your paddle. Use your board while sitting in kayak mode when you need a rest or greater stability.
The polypropylene blade secures to the paddle strong velcro straps, and is easy to remove and store on your board when not in use. This item might also be used, with duct tape, as an emergency paddle blade for kayak paddles.