Pack of 4 Heavy duty 2mm greyboard for covering then using as album covers. Holes can be put into it with the crop-a-dile and fastened with book-rings. Can also be used in the PINK bind-it-all or the BLUE one if covered in thinner paper. Corners can be rounded with the corner chomper or the bind-it-all corner rounder. It cuts on the cuttlebug or the bigshot with Bigz/Original dies - not suitable for thin dies. Looks great distressed or painted.