Cold Steel 91MK Koga SD, Mini Koga SD2 Thickness: 1" Self-Defense Tool Overall Length: 6 1/2" Public Safety - Personal Defense Made of virtually unbreakable plastic Martial arts expert, former Air Force soldier, and 25-year veteran of the LAPD Bob Koga eponymous weapon of choice Made of virtually unbreakable plastic; can increase average person's ability to defend him or herself Can function as useful aid in leverage when obtaining joint locks or submission holds 6.5-inch length, one-inch diameter, and 2.1-ounce weight; made of structural nylon Includes limited manufacturer's warranty; details included with purchase