This Kershaw Blur knife is a Ken Onion design that features Kershaw's patented SpeedSafe technology so you can give the ambidextrous thumb-stud a push and the knife takes over opening the blade the rest of the way. This assisted opening knife is overall open length 7 7/8 inches long with a blade length of 3 3/8 inches. Closed it is 4 1/2 inches and weighs in at 4.2 ounces. This is the Kershaw Blur Black Black Blade Spring Assisted Knife 1670BLKST. The blade is Sandvik 14C28N stainless steel.