I purchased 2 of these inner tubes for a couple of 27" tires that I had also purchased at the same time. Both of these inner tubes were defective! I tested them right out of the box. Before putting them in a set of tires and on some rims, I attempted to inflate them. However neither one of them could hold air. One of them was expelling air nearly as fast as it was going in, and the other had a slower leak, but was still audible. Upon holding each under water to see the damage, 7 pinholes were revealed on one inner tube, and a single hole on the other. To receive 2 defective inner tubes at once from this company has ensured that I will never buy from them again. Steer clear of these!