I'm pretty sure I've used the exact same razor blade in my precision knife for at least 3-5 years, no problems. Thinking there was nothing wrong with that, he blacked out very little. I then got a lot more diligent in using it with various Cricut Machine crafts and decided I should change the blade, found this one, thought it too good to be true for the price but will at least try it anyway. Comes in a cute little case to store all the blades until you need to replace them. HOLY MOLY, this thing cuts through butter like a hot knife! I didn't realize I needed a new blade so badly! Since then I have changed them several times, there are probably 45 blades left. I think they will last me for the next 10 years, but in 10 years I will be back to buy another set! You cannot and must not walk past it!
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