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Bought these because of the price. Compared to multiple other brands of teflon tape I've used, these don't work so well. Under a load of 150psi on a thread size of 1/4 to 1/2" NPT, there was a fair chance it would leak on the first use, no matter how many wraps you do. I was taught to do 3-4 wraps, but when it would still leak I tried less, I tried more (up to 7), and it doesn't matter. If it doesn't work first try you can rewrap it and it will probably hold pressure, but still tedious.