By size, do you mean the size of the material it will cut? The regular Cake will cut material 12" wide while the mini's cutting mat is 6" wide. I use my KA pasta roller to prepare gumpaste for the cutting mat, and it will only roll a strip about 5 1/2" wide, so my mini serves as well as my regular Cake in that dimension. I can load two strips on the bigger mat and do have the option of hand-rolling a wider piece if I need to. Most cake tiers are about 4" tall, so most cake work can be done with the mini if you're decorating the sides.