Cattle Banders Tri Bander Ring can be used on calves up to 350 lbs and no tightening, just open and close. Opens up to 2.5″ by 2.5″ by 2.5″, bigger than the other style banders. Bands are 2x stronger than the little green cheerio type bands and they have a flat edge so they don’t roll off the applicator. Easy and quick operation. Works on calves, goats and sheep.