Radiator Type: Anti-slip design, useful and practical. How to : Remove the bottom case and wipe the dropped with a dry cloth to wipe off the dust, but do not get wet. Heat the dropped with a hair dryer, when it hotted, stick on the rubber foot directly. Press until it is cooling, then turn over the bottom case, toast the cylinder with a lighter, after it dissolves, press it quickly to let it stuck in the bottom case. Shape: Round : for Pro A1278 A1286 A1297 13 inch 15 inch 17 inch Features: Useful, Unibody Bottom Case, Non-slip Mat Color: Black Material: Rubber size: 2*2cm Package Contents: 4 x Foot Pad for (Laptop Not Included) , , or are registered trademarks of , Inc. Products are and not endorsed by , Inc. Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.