Tunewear MB13-EGG-SHELL-01 Eggshell for MacBook Air The clarity of the case allows one to still enjoy the color of MacBook Airs brushed aluminum finish. Four rubber feet on the bottom of eggshell keep MacBook Air from sliding during typing, and the case ensures that MacBook Air stays put when placed on smooth surfaces. Eggshell does not obstruct any of the MacBook Air ports, so the MagSafe and USB ports are fully accessible.