Sorry for your bad experience ladies. Maybe they were old (?). I have bough 8 packs and have had great results. They cut better than my rotary cutter (six layers well instead of 4 - no sliding). I don't know what to say. Hope you find a better replacement. The only thing I noticed is that the curved "washer" on the center of the blade that holds it in place has to be bent in (two c shaped sides closer together). Then they are held tighter in place and work great.