The CTD sanding pads work very well for getting the level of grit that I want when resurfacing my bowling balls. I really appreciate that they come in several grits, including ones that other companies do not provide. My only slight negative is that I wish the fabric backing was stronger when it comes to wearing down from attaching it to a velcro cup, and that I wish the initial grit lasted longer. But, it's sanding pads, so what do you expect? Overall, I think that these are definitely worth trying out.