The Continental TPU inner tube is lightweight, compact, and reduces rolling resistance. TPU is a combination of plastic and silicone material, making it both sturdy and flexible, and long-lasting. The high-quality TPU, consisting of 7 sealed layers, maximizes airtightness and durability. The inner tubes are uncolored to ensure maximum quality and prevent finishing errors. The valve base has a slightly conical shape to improve the fit on the rim and reduce unwanted movement, while the valve has an internal thread to allow the use of valve extenders or a replacement valve core.Lightweight inner tube made of Thermoplastic Polyurethane (TPU)ETRTO size: 25-622 > 35-622Very light: 35 gramsLow rolling resistanceSmall volumeEasy to repair (repair kit included)Continental Article number: 738689 EAN code: 4019238326581 Supplier number: 0182721 Retail packaging: Yes