[phonconn]

Bratton's imports from China real rubber tubes and are the only real rubber tubes available on the market. Sadly they are China but Jeff at Brattons explained that that is the only place in the world he can locate all rubber inner tubes. I have purchased a set and cut off the rubber stem and installed original valve stems and they seem to be holding up well. I think any inner tube is going to loose air over time but these seem to do as good as any. Back in my Model A beginnings a friend in St Louis(Willis Schwendt) worked at Cupples Rubber and they made all rubber tubes but those days are long gone. Only alternative left are those from Bratton's is my opinion. Good luck.
Dan B in Missouri