Spyderco produces knives under their own brand as well as the byrd brand. The Spyderco pocket knives can be differentiated by the traditional round opening hole while the byrd pocket knives have the "teardrop" shaped opening hole. The folding pocket knives all have blade lengths under 4 inches which make for a less bulky carry in your pocket. Spyderco pocket knives feature either a plain edge, a partially serrated edge, or the fully serrated SpyderEdge blade style.