G-Force double action knife is both an automatic ,if you know where the secret button is ,and a manual opener. Amaze and confound your friends with your mastery of opening this knife automatically. They will search and search and not be able to find the hidden button. We even had one client write us about his experience with airport security when he forgot to remove the knife from his pocket. Fortunately for him, security never knew it was an auto and they let him stow it in his checked luggage! The handle is stainless steel layered with fiber reinforced nylon and has a liner lock action. 3 inch blade 7.25 inches total 440 stainless steel blade.