The Yun SCM Butyl Rubber Inner Tube Bicycle is a high-quality replacement tube designed for 26-inch wheels with a 35-43c tube size. Made from durable butyl rubber, this tube is black in color and features a Schrader valve for easy inflation. The set includes a stem, making it convenient for cyclists to install and use. This brand new, self-sealing inner tube is ideal for maintaining the air pressure of your bicycle tires, ensuring a smooth and reliable ride.