Where it is rigorously tested for strength and durability. The tannery also comply with strict eu regulations and directives regarding chemical use during the tanning process. The macbook air is now available in either the standard 13 inch version or the retina display version, these are slightly different sizes.Please select your model so we can make a case to perfectly fit your device. Standard 13 inch - height: 24.5 cm width: 34.5 cm depth: 0.5 cm. Retina display 13 inch - height: 23.5 cm width: 32.5 cm depth: 0.5 cm. This item is made of leather and hide.