1) No effect to your Macbook and easy installation.<br />2) Protect your laptop against dust and moisture.<br /><br />3) Material: The case is plastic hard case with silk leather<br /><br />About Model Number:<br />Please kindly check the model of your Macbook before purchasing!<br /><br />Note: If you're not sure the model・ please kindly check the back of your macbook・ you could see the model (Axxxx) printed there・ or contact us by ebay message・ we will reply asap.<br /> <br /><br />A. Pro 13'' A1278 (Have CD-ROM・2009-2012)t<br />B. Retina Pro 13'' A1425 and A1502<br />C. Air 13 ''<br />D. Air 11 ''<br />E. Pro 15'' A1286 (Have CD-ROM・2009-2012)t<br />F. Retina Pro 15'' A1398<br />G.Macbook 12 '' <br />H. Pro 13 A1706 A1708<br />I. Pro 15 A1708<br /><br />About Keyboard Cover <br /> 1) The keyboard cover do not fit MacBook with Europe Version keyboard layout. The "Enter" Keypad is different.<br />(US version: "Enter" key is horizontal. EU version: "Enter" key is "7" form).<br /><br />2) If you want the EU/ UK version keyboard cover・ please kindly note us.