I buy the ones from harbor freight. I use them all the time and have been for years. I don't have a problem with the. but they are cheap enough 2 for 2.50. and like I said if there's a problem, bring them back. in my small mind I would think if they are good enough and sharp enough to cut through the fibers and backing on a carpet, then they should be able to cut my thin cotton fabric. but I guess until you have a problem they are fine.