I have an O'Lipfa Lip Edge 36". I think it's 36X4. I don't use it as much as the 24" version, but it really does come in handy at times. I have the white mat and use it, however, I have a problem when cutting batting, like just before you put the binding on. the batting sticks into the cuts made by the rotary cutter and is hard to get out. i use a fiskars mat if I'm going to cut batting.