The Continental MTB 29 x 1.75 - 2.5 inch Schrader valve Inner Tubes are premium quality rubber tubes designed for cycling enthusiasts. With a Schrader valve for easy inflation and a thickness suitable for 29 inch wheels, these tubes are durable and lightweight at only 0.46 grams. The Continental brand ensures reliability and performance, making them a great choice for any cyclist looking for quality inner tubes for their bike. Plus, with free postage included, this deal is hard to beat!