The Callicrate PRO Bander loops/bands are used with the New Callicrate PRO Bander from No Bull Enterprises. The loops are bright green to help the user verify the loop is secured and placed properly. There is no wrong way to load the loop and the loops are larger for easier application. Extra-strong bright-green Callicrate PRO Loops, for use with the PRO Bander, are specially formulated to withstand and maintain the high tension needed for consistent results. The special latex formula is over three times stronger than comparable latex rubber. The formulation and curing of the rubber gives it the elasticity, strength and memory necessary for fail-proof application. The PRO Loop uses a self-locking clip – no crimping required. Callicrate PRO Banders, recommended by veterinarians and animal handling specialists worldwide, are the most humane and effective castration tools on the market. Due to emphasis on high-tension ligation, the banders excel at achieving a tight band every time. Easy-to-read tension indicators ensure the correct tightness that is essential to minimizing discomfort and reducing physical complications.