Throughout the world, more people rely on our A Series than all other buoys The A Series is the product that launched the Polyform story. This all-purpose product, with the signature "blue ropehold," has proven itself in the most adverse conditions. We&&';;ve made a couple of changes to the legendary A-Series for 2001. There&&';;s a new size - the A-7, with more buoyancy than any other buoy in its class, and a redesigned ropehold. The new ropehold has been incorporated into the A-5, A-6, and A-7 and features stronger ribs, a larger eye that accepts a standard shackle, and a new "dual valve" inflation-deflation system. Marking gear in heavy seas is no easy task. That&&';;s why more fishermen use Polyform A Series than all other buoys combined. We&&';;ve seen and heard the testimonials from our customers. You name the ocean, sea, or river, and the A Series has been there. Put your trust in Polyform&&';;s most versatile and well-known product. Primary use is as a mooring or marker buoy. Also makes a great fender for boats to 50&'; Measures 17" x 23" when inflated The only truly one piece buoy still made Polyform&';s unique vinyl valve system - the industry&';s best and most reliable Even wall thickness for maximum strength and durability