absolute rubbish! I understand they are very cheap for the price so I wasn't expecting much. I only ordered this pack to lighten some of the inside and outside edges on the six closet doors I made. those lips parted instantly. I went through all the medium grit sponges before finishing the doors. It's also worth noting that the sponges themselves don't list or mark the grit, so it's a guess-and-compare game.
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