High Quality Metal The Avengers The Thor 16gb USB 2.0 Flash Drive Convenient - small, capless and pocket-sized for easy transportability Durable - metal casing with sturdy ring 1.5*0.9*2.5in(L*W*H) Supports WINS 7/8/98 / SE /ME / 2000 / XP, Vista and Mac Hot plug & Play;No external power supply requird