A new line of leather skins designed for the Retina MacBook Pro and MacBook Air has been released by onanoff. The leather skins are made with a strong adhesive coating that attaches to the MacBook's surface, but can still be removed without leaving any residual markings. Four different color options are available for both MacBook models, including Royal Blue, Fiery Red, Black Onyx and Oak Brown. The skins can be purchased online through onanoff's store with prices range from $50 for the 11-inch MacBook Air variant, up to $60 for the 15-inch Retina MacBook Pro.