It's stable and easy to control like your old tube – only it's much faster. No recessed center like traditional inner tubes, which means there's nothing to slow it down or brake acceleration. Heavy-duty, seam-welded PVC bladder is covered with double-stitched, 840-denier nylon for puncture- and abrasion-resistant durability. Four nylon-covered handles with neoprene knuckle guards eliminate chafing and increase comfort. Kwik-Connect compatible. Exclusive racing graphics. Two-person capacity. Diameter: 58".