Castrator. An improved version the original Callicrate bander featuring built-in brains that sense the proper tightness every time regardless of operator or the size of the animal. It takes the guess work out of determining the proper tension. A fast, easy, and effective non-surgical method of castrating large animals. The winding mechanism tightens the heavy loop made from the strongest material available with little effort and the clip design holds loop securely in place. A tetanus toxoid must be used.