A "protective leather shell" for a Macbook or Macbook Pro is likely a protective case or cover made of leather that fits over the exterior of the laptop to protect it from scratches and damage. There are many different brands and styles of protective leather shells available for Macbook and Macbook Pro laptops, and they can be found at electronics stores or online retailers. It is important to choose a protective case or cover that fits your laptop well and provides sufficient protection for your needs.