SISUN 3.5 Inch HDD Protective case , 3.5" HDD Storage Grey/Purple/Yellow/Blue/Green (3.5"Purple) Stylish, portable and ingenious design, high quality plastic masterial injection molding, thicker and stronger for professional satifaction. Shockproof, waterproof, anti-static and dustproof, ideal solution for 3.5 inch hard drive protection Built-in anti-vibration and anti-static cushioning mat for maximum HDD protection, Strong snap lock and reinforced internal and external rib design design, easy stacking with not sliding. With marking label on the front of the box for convenient HDD library management .