Me renovate furniture as a hobby and they really cut down on sanding time as I just attach them to the sander. The grains are clearly marked on the back, but they will wear down as you use them, so you can have a marker handy if you can't tell how it feels after you've taken it out to replace the grains . They remain very tight during use. I increase the grit as I go but it takes a lot of sanding before they wear out and can be reused until fully matte. Great purchase, will definitely order as needed.
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