Manufactured with a thermoplastic elastomer, called TPU. These tubes are lighter, and more robust than traditional butyl rubber inner tubes Over rough and smooth: Tubo-CX/Gravel is ready for disc and rim brakes Offers double the toughness on and off the road compared with standard rubber tubes At the same time - due to its low weight of 54g - it guarantees a lively pace 50% smaller packed size makes a spare tube that&';ll fit in any pocket or pack Shaft Type: Smooth Tube Compound: Thermoplastic Elastomer ISO Diameter: 622 / Road / 700c Valve: Presta - choose; 42mm, or 60mm Weight: 54g