These are bike tubes. They hold air well as a bike tube should. Only adding air every few weeks. One tube had a big hole right out of the box which was a major disappointment but BikeTiresDirect sent me a free replacement and now I'm good to go. Fortunately I was buying two only to have a spare so I was able to ride until the replacement came. I can only hope the bad tube was an anomoly.
When the tubes were advertised it was said they were great at holding air pressure for long periods of time. Well its true. I only air mine up every four to five days and could probably go longer if I wanted to push it. Well made product.
I purchased these Schwalbe tubes while on sale as they were less expensive than the brand of tubes I usually use for my road bikes. So far so good and don't have any issues to report.