Red/Black 15” Diameter (inflated Size: 15" x 20") Mark Buoy Mooring Buoy Anchor Lift Buoy A38

I am not a boater I am a boxer. For use as a punching bag there are some issues. The fill hole is at the bottom and does not allow water in as easily as other buoys. For this reason I had to drill a hole in the top which made it easy to fill but hard to seal. I put a bolt in the hole and a whole lot of krazy glue but the glue does not stick to the rubber very well so I occasionally get a couple drops of water flying out when I punch it. This also made it hard to fill to the very top so mine has more empty space than I would have wanted. That said the product has a great feel being soft on the outer edges but feels hard when punches penetrate closer to the middle creating a feel like punching a strong fat person. Even with these flaws it is one of my favorite punching bag because of the unique feels ( I have seven I use and several more I don't). But I wish I could have a buoy this big that could be filled more completely and sealed more completely. As for value to boaters I have no opinion

Great quality. Do not over inflate just like all other balls as they expand in heat, When not in use cover from Sun/UV and they will last a lot longer.

durable enough to use as a winter mooring ball.