Made of high quality plastic material can place two 2.5" hard disk at the same time. Hard disk box clever design the use of reinforcement function for folded recommended should be stacked up to five layers. Super card buckle design can be repeated with more than ten thousand times. Internal and external reinforcement design reduce stress and prevent deformation. Back transparent design transparent part from hard drive form accordingly. At the front with a proprietary content indicator stick on your hard drive your hard disk data store content can classify. Materials (thicker) more strong. Better design (arc connection design and open rack mount more reliable;. Embedded large pieces of sponge better more stable shockproof can better protect the hard disk