For those who are not members of the German Poultry Breeder's Association there are still closed or clip on rings of different materials and in different colours and with numbers or alphabet available: https://stengel-fussring.com/shop/kennzeichnungsringe/I'm used to close banding my finches and small hookbills when breeding, but I'd love to be able to more permanently band my chickens, and I hate wing bands. Not to de-rail the thread, but do you mind explaining those a little bit?