Schwalbe AV4 40mm Schrader Tube, 16/18 x 1 3/8

Schwalbe Standard tube Item 4. For bicylce tires in 16" inch and 18" inch (ETRTO 28/37-340/355). Retains air pressure considerably long. Due to the best material quality and constant wall thickness. Highest reliability. Proven millions of times.