[1] Item: USBLL105 [2] Color: Black [3] Size: 2.28*0.75*0.39 Inches [4] Material: metal+ ABS [5] Quantity: 5PCS [6] Capacity: USB2.0 8GB (MLC flash chip) [7] Write speed: 12MB/s [8] Read speed: 22MB/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.