1、Long Lasting Use: Made of thermoplastic polyurethane elastomer(PU), this bow roller is designed for durability and reliability, not susceptible to aging and cracking. 2、Practical Roller: This roller will not rust or mark your boat, providing protection and cushioning to the hull when secured against bow stop brackets. 3、Safe and Shock Absorption: Designed to support the weight of your boat on the trailer; absorbs road shock, ensure boat safety and prevent damage during transportation. 4、Boat Centering: The bow bell assembly prevents bow to bowstand contact, helping to center the boat and improve stability during transport, providing enough convenience. 5、Versatile Usage: Suitable for trailers, boats, and yachts with a 4 inch bow roller featuring a 1/2 inch shaft, the 7.2 inch full length roller ensures reliable use. Item Type: Boat Trailer Roller Assembly Material: PU Size: 4inch Center Bow, 1/2inch Shaft, 7.2inch Total Length Fitment: Suitable for Trailer, Boat, Yacht 1 x Trailer Roller