This is a tray to support your Cameo 4 cutting mat when you are cutting something out. Previously we had supported the mat by hand, but as our designs get more complicated, it has become a tedious task. This tray was designed to fix that problem. We found it especially useful when cutting intricate paper designs as those would lift and tear when bent Package Included: 1xCutting Mat Extender Support Set For Cameo 4 NOTE:This Tray Not Compatible With Cameo 3 , All the machines in the pictures are not included