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. Marking gear used in heavy seas is no easy task. That's why more fishermen use Polyform A-Series than all other buoys combined. You name it ocean sea or river and the A-Series has been there. Put your trust in Polyform's most versatile and well-known product. Features - Even wall thickness for maximum thickness Heavy duty reinforced ropeholds Polyform's unique vinyl valve system Redesigned ropehold for A-1 through A-7 for improved strength and durability Dual valve inflation/deflation system for sizes A-5 A-6 & A-7 Excellent rafting fender choice Offered in seven brilliant high-visibility colors Size - 21.5 x 28 in Eye Diameter - 1.0 in Circumference - 67.5 in Buoyancy Ratings - 187 lbs Product - POLYFORM A SERIES BUOY A-4 21.5" DIAMETER RED Manufacturer - POLYFORM US Manufacturer Part No - A-4-RED