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There are several Spyderco knives available in the market, each one with its own unique features and capabilities. There are the automatic knives in which the blade can be retracted by pressing a button from its handle. There are also spring assisted knifes these knives are opened partially and is brought out the rest of the way with a spring that snaps the blade in an erect posture. There is also the butterfly knife which is patterned after the Philippines; this knife is commonly known as “balisong”. Another is the out-of-the-front knife in which the blade comes right out the handle and lastly the fixed blades which are common, for the blades need not be opened or set. Examples are jungle bolos and hunting knives.