The Impulse is a great spring assisted knife from Buck. Very similar in design to the Rush series, the Impulse features 420HC stainless steel blade. The 6061 T6 aluminum handles are anodized blue. The Impulse features a push bar safety located on the back of the knife. The knife can be fired with the dual thumb-studs or with the small metal lever located on the back of the knife (only visible when the knife is closed). The Impulse, both fashionable and functional, is certain to be a valued addition to any knife collection.