I used a thin sock put a block in there and tied a knot in it. I just bash it on each hand, rub together and good to go. Some people put it on thick but I find this is enough for the weight I'm lifting at the moment. It makes a bit of mess but I wouldn't be too concerned about it. I lift in my shed though so noone to complain about the mess but me. I think I got mine off ebay, came in a box of 8 blocks I think.