The perfect solution when you need to add a little extra thickness to die cutting sandwhiches. These shims can be used when the paper thickness varies or if a die doesn't cut the shape completely. Made of PET, also known as mylar. This packages contains three shims so you can use more than one if necessary. Compatible with many manual die-cutting machines. Not a cutting suface. Place shims between adapters and cutting base to avoid damaging the shim. Shims measure 6.125x8.625 inches.