[1] Item: USB815 [2] Color: silver and black [3] Size：2.32*0.75*0.39 Inches [4] Material: metal and plastic [5] Quantity: 100PCS [6] Capacity: USB2.0 512MB (SLC flash chip) [7] Write speed: 7MB/s [8] Read speed: 14MB/s [9] Package: poly [10] Warranty: one year [11] Support windows7 / 8 / 10 / Vista / XP / 2000 / ME / NT Linux and Mac OS [12] We used H2 software to test all flash chips by copying machine.