I bought two tubes, and one came with a hole in it. But that's on me, I've bought enough tubes to know you should always buy more than two. To their credit, BikeTiresDirect gave me a quick refund.
had a couple of other Kenda's fail where the valve stem meets the rubber. They lasted 10 years, but both failed within a week. Hoping for better with these. Not a lot of choices in the tube market.
These tubes are nice and light, but I was pleasantly surprised at how compact they are (in comparison to other quality brands) - great for fitting my small saddle bag! And as always, a great price through biketiresdirect.com.
Discounted commodity purchase. Air loss at about 2%-3% daily. If using long stems on shallow rims, be sure that value stem is secure or some flats will occur at valve base. Have patched and the repair provided a lasting seal and a useful tube. Many punctures seem to happen near a seam, so patching is useless.