Sony 4 Gb High Speed Memory Stick PRO Duo Media with Adapter (Bulk Package) SONY PRO DUO 4GB High Speed MAGIC GATE Memory Stick for your PSP, Digital Camera, and more! Memory Stick pro duo offers next generation technology providing high pixel still image and real-time moving image recording High speed data transfer Dimensions (Approx.): 0.79" x 1.22" x 0.06" (20mm x 31mm x 1.6mm)