Schwalbe DV7A

"The Schwalbe DV7A standard bicycle inner tube is the ideal choice for anyone looking for reliability and durability. Developed for bicycle tires in size 20 inches (ETRTO 28/37-438/451), this tube offers above-average air tightness. This is achieved by the excellent material quality and a consistent wall thickness, which ensures that you can rely on your tires no matter where your ride takes you."
"Tried and tested millions of times, the Schwalbe bicycle inner tube stands for the highest reliability. Whether for the daily commute to work or for longer weekend toursu2013 this inner tube was developed to meet the requirements of modern cyclingu2013. It not only offers outstanding performance, but also easy installation that saves you valuable time."
"Trust the quality of Schwalbe, a leading manufacturer of bicycle tires and tubes, and experience the difference that a high-quality tube can make to your riding pleasure"