Schwalbe AV4

"The Schwalbe Standard AV4 bicycle inner tube is the ideal choice for anyone who demands the highest reliability and quality. Specially developed for bicycle tires in the sizes 16" and 18" Inch, it covers an ETRTO range of 28/37-340/355 ab. Thanks to the above-average air tightness, your tire stays inflated for longer, which makes regular inflation unnecessary. This exceptional longevity is achieved thanks to the excellent material quality and the uniform wall thickness that Schwalbe guarantees in its tubulars."
"Tried and tested millions of times, the AV4 inner tube from Schwalbe not only offers maximum reliability, but also carefree riding pleasure. Whether for the daily commute to work or an extended weekend tour, this tube ensures that you can concentrate on the essentials: riding. Put your trust in Schwalbe's proven quality and experience how a small but crucial component can make all the difference."