Yes, most of the foam on the newer dies is two toned so you can figure out exactly where the shape is, but some are all the same color and you may want to mark a registration line or two. I first use masking tape and then when I'm sure of where I want to mark I use a pen. I also marked the name of the die on the foam on a couple of them. For instance, the 2.5 and the 2.25 strip cutters look pretty similar when you are laying the fabric on them. after mixing them up once, I marked the foam so I could easily double check.