The A Series Poly Ball from Polyform is an all purpose buoy great for use as a dock bumper, anchor release float, harpoon rigging and many other uses. These commercial style super durable and strong poly balls with the signature "blue ropehold" has proven itself in the most adverse conditions. Marking gear used in heavy seas is no easy task. That's why more fishermen use Polyform A Series than all other buoys combined. A Series Poly Balls from Polyform feature even wall thickness for maximum strength and durability. Polyform's unique vinyl valve system is simple to fill. Made in the USA by Polyform US LTD.