Read = 100 MB/s / Write = 22 MB/s = Value rating = 5.5 ( Value is total MB/s per £ ) Weight = 13.6 g L = 8.1 W = 2.5 H = 0.9. Pros: The keyring fastener wont break, its built into the body of the key. Cons: Only a few suppliers, loose cap. [May '12 USBFlashPro]