CWB Connelly Big O Towable Tube56 Diameter (deflated) Single rider, fully covered round tube 420D Nylon cover, fully enclosed, heavy duty bladder 4 padded handles with knuckle guards for added safety Boston valve for easy inflation and quick connect tube rope attachment The Big O is a durable, fully covered round tube that provides extreme fun out on the water. Laying prone or sitting in the center location, the rider can choose which position they favor best. This proven design