Kemp USA's Throw Line and Buoy Ball features a heavy duty polypropylene rope and an attached durable foam float. It includes an aluminum ring buoy holder that you can attach to most surfaces to conveniently hold the throw line as well as the Kemp USA Ring Buoy. We recommended the purchase of this product with every ring buoy purchase. This item is mandated by many state codes. Comes in three convenient lengths; 30 ft, 60 ft, and 75 ft.