This discontinued Benchmade 672S Apparition is an automatic assisted opening knife- you give the thumb-stud a push and the knife takes over rocketing the blade open. The knife comes with instructions on how to convert the knife from auto-assist to a manual knife (and vice-versa). The Optimiser® mechanics. You control its destiny. Inject the spring rod and it’s blade appears quicker. Drop the rod, things return to normal. You choose the blade speed.