Bigger, stronger, better EZE bander allows for superior one-hand control and provides the most humane method of castrating. Latex bands have 170% larger opening than standard bands and are twice as strong. Flat sides prevent bands from rolling off bander. Calf size includes 10 bands and is for use on newborns or calves with golf ball size testicles (up to 400 lbs). Extra bands sold separately (25’s). Tetanus Toxoid should be used unless directed otherwise by your veterinarian. Made in the USA.