Mine should be a fiskars rotary blade size 45, cause that's who makes it. Works pretty slick, but the surface has to be completely flat. My big folding table has just the slightest bow and isn't cutting well even with my rotary's. Have to line everything up to the middle of the table where there must be a brace. Other than that it's fine. Did 6 pcs of fabric the other night. Cut like butter. But I cut all of my fabric 3 colors the wrong sizr. Grabed the binding ruler instead of the 3" ruler and cut up all fabric. Did not know this until I tried to pc them to my 9" squares. Was making a warm wishes quilt. Had to go back and make all my squares 6". My goof for the week, hopefully.