I use them and think they are great, as is BikeTiresDirect. They always do the right thing and have the best customer service in the business IMO, unlike the "big kid" on the block. Unlike some of the one's I have bought on eBay, these actually fit the threads on the pump head. Ask yourself this when it comes to buying large quantities of CO2 cartridges: how many of these do I use a year. In my case with 10,000 miles in the last year the answer is, none. No disrespect meant to anyone through this post.
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