The dry erase pocket sleeves are made of PVC material of 0.15mm thick. Our pocket protector opens easily for loading and unloading. It comes with a convenient marker holder on the top to store dry erase pens, and the metal grommet in the middle is not only great for hanging onto the wall for displaying assignments or drawing, but it also allows you to snap several pockets together for orderly storage.Use it for classroom lessons, practice handwriting, storing documents or for shop work order tickets.