Schwalbe AV1B

"Experience unparalleled reliability with the Schwalbe standard bicycle inner tube Nr. 1B, specially developed for 12 inch bicycle tires (ETRTO 28/40-203). This bicycle inner tube impresses with its exceptional airtightness, which is guaranteed thanks to the high-quality material processing and uniform wall thickness. This quality has proven itself millions of times over and offers you the safety you need on your bike tours."
"The AV1B bicycle tube from Schwalbe is known for its durability and its ability to hold air for longer than average. Whether for the daily commute to work or for extended weekend bike rides, this tube offers you the reliability you expect from a Schwalbe product. Trust in the proven quality and innovative technology that goes into every Schwalbe tube."