STM Dux Rugged Case for Microsoft Surface Pro 4 - Black (stm-222-103L-01) Exceeds US Mil-Spec 810G drop test (26 drops from 4 feet) for the most accident prone among us Infinity Stand accommodates nearly unlimited viewing angles for typing and drawing Surface Pen storage allows magnetic connection for quick access while working, and rear storage discreetly secures the Surface Pen for travel Transparent back panel to customize your case with photos, asset tag for schools & businesses, or allow your pristine Surface Pro 4 to shine through Access to all ports and buttons Textured bumper prevents sliding Simple device installation/removal with no need for special tools