TonfaTonfa Dark Moons Tonfa is a modern police baton based on a traditional martial arts weapon. The Tonfa is 60 cm long with a perpendicular 20 cm handle carved with a spiral pattern for extra grip. A 5 cm wide knob at the end of the handle is also designed to keep your grip firm on the weapon. When held by the handle, the shaft acts as a splint to shield the hand and forearm. It can also be held below the handle, using the t shaped handle as a