www.sog-knives.net The SOG Twitch XL with the black handle is a large version of the original Twitch. This model TWI-22 has an AUS 8 stainless steel fine edge blade that is opened by the SOG Assisted Technology. When the thumb studs are pushed, the blade comes flying out lickety split. The handle is made of hard anodized aluminum, and the knife is carryed by a pocket clip.