Wean calves from sucking milk with these Calf Weaners Plastic Nose Rings! It comes with two pieces of nose rings that are easy to attach to cows! What these rings do is prevent calves from attempting to suck milk from their mothers. This way, they can learn to feed on grass instead and prevent diseases that they may get if they continue to suck milk. These are plastic rings so they are lightweight and won’t cause discomfort to your cows.