Easy to remove and reuse Can be opened wider Used to identify similar looking birds with ease Use them to separate different breeds, mark suspicious roosters by separating hatches Rings divided in half into a small hinge, making them easier to put on the leg Suitable for various poultry, birds, chickens, ducks, etc Specification: Material: Plastic Color: As the picture(Color sent at random) Height: 6mm/0.24" (Approx.) Inner Diameter: 8mm/0.31" (Approx.) Quantity: 100pcs Note: Size for manual measurement, there may be 1 to 5mm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 100 x Poultry Leg Rings