I cut my used Go mats to fit around the die shapes that I only want cut. Good tin snips cut the mats easy. The die blades only come out of the foam if a mat is over it. It takes the thickness of the mat to compress the foam to expose the blades. I was listening very closely when a DH apparently an engineer, was interrogating the demo person at the Go booth last year in Paducah, with every design question he had. In fact he was the one that after examining every cut that said so the mat is what made the blades expose, not the rollers. I think he did everything but take one apart! He did buy two of them, one for his wife and one for his sister.