They are furniture shims, made of premium and durable material. It is constructed of high grade PVC that is easy to use and install and stackable to store. Ribbed design helps stabilize and level an uneven toilet or furniture, use to stabilize and level various objects. Features -Material: PVC. -Possess non-slips textures so as to prevent displacement and do not slips, with more secure superimposed cushion height, they can be placed directly without installation. -Also can effectively avoid the unstable shaking of the furniture, you can place them on the bottom of refrigerator, table, chair. -The door can be stuck to prevent the door from , or it can be closed automatically to fix the desk and prevent the desk corner from being unstable. -Our furniture leveling shims can protects the ground and avoid direct between the table and the stool. -The workmanship of this product is perfect, and you will have a good experience in using it. Package list: 8 x furniture levelers