All of my cows calve during September and October with the bull going back in on November 20th. I was working alot of overtime at my off farm job during calving and did not get the bulls banded as I normally do. The calves are about 400lbs now. I was thinking of buying a larger bander and banding them after weaning as I background them through the early summer when the grass greens up. I have never used one of these banders and was wondering which one some of you might think is best as in easiest to use, most durable etc. Also, once they are banded approximately how long does it take for the band to do it's job? Any advice is appreciated.