Each of the cases found in this 10-pack of black 3.5" Hard Drive Cases is designed to hold both 2.5" and 3.5" bare hard drives. The anti-static, shock-proof case is designed to hold a single 3.5" bare hard drive. Place the insert inside the enclosure and it will then hold up to four 2.5" bare hard drives. Once the drives are inserted, the enclosure snaps closed ensuring the drives are protected from dust, wear and tear. This hard drive case is constructed of PP plastic material injection molded with an external and internal rib design to prevent damage to the enclosed drives. Along with enhanced construction, each case comes with a label area for easy identification and can be stacked for easy storage.