he O'Brien Hammer Head Towable Tube is a lean, mean, thrill machine. This shark has all you need to get its rider screaming around on the water. All in good fun, though. They will hold on as the tube glides across the water to one of the two sets of handles and remain comfortable because this Hammer Head is equipped with EVA Knuckle Guards and an EVA Pad. Durable and reliable, any rider will love every second they're on the O'Brien Hammer Head Towable Tube, that is, until you dunk them in water.