Sog TWI-201 Twitch XL Tanto. The XL is classy...it moves well, looks right, walks the walk, and talks the talk. It is not just a larger version of a Twitch. It is serious business that can more than get the job done. This is a high-tech statement of sophistication with all the bells and whistles that you expect from the designers at SOG, including our SOG Assisted Technology. The fine construction comes together to make the XL one of the most practical and beautiful knives that we have ever handled. Now we've also added our 'practical tactical' tanto blade, creating a great combination of beauty and beast.