Material: The chicks leg rings are made of quality plastic, which is durable, non-toxic and without deformation for long-term use. SizeThe inner diameter of the chicken thigh ring is about 20mm.You will receive 100 pieces of strips in total, with number marks ranging from 1 to 10.The printed numbers are not easy to smear, smudge or fade away, which makes it easy to looking for your chicken. Safe: They are very durable and not easy to break with cold, freeze and heat resistances. Safe and reusable. Easy to apply: Simple clip design makes it easy to apply and remove, Different breeds easily without the need for tools or scissors, numbers and keeping strips bright enough to make your chickens and ducks easy to find. Widely Applied: Chick foot rings can be applied in poultry farm management or breeding, identify different ages, breeds, marked roosters and hens. Suitable for breeds of poultry, ducks, chickens, hens, etc.