HIGHT QUALITY and ECO-FRIENDLY - These doorstops are made of superior PVC rubber, soft, strong enough to hold the door firmly. and recyclable to stay healthy for your family and environment. EXCELLENT DESIGEN - These stoppers are designed with grooved base and small bulges on surface, no-slip, so as to increase the force of friction and strong gripping power. effective to keep doors firmly in place. ADJUSTABLE HEIGHT - Max High: 0.59\\/1.5cm , you can stack doorstopper to fit thickness for different clearance, and 6 door stoppers could be stacked together for fitting the maximum gaps up to 3.54\\/9cm. GREAT SUITABLE - suitable for all surfaces and doors, such as wood, carpet, tile, wood door, bedroom, kitchen, childrens room, office ,warehouse,school shop etc. Product color: off-white