Description: Size: The Pigeon Foot Rings are approx. 8mm/0.31" in inner diameter, 10mm/0.39" in height. (Warm note: Before placing an order, please check whether the size of the product is suitable for your birds.) Sufficient quantity: The package includes 100 pieces birds foot bands, can help to keep different breeds apart, make your bird easy to be found in the bird flock. Easy to use: Reusable, easy to put on and remove. Safe and durable material: The bird leg rings are made of quality Aluminum, safe to use and durable, and not easy to break. Wide Application: Suitable for various poultry, birds, hens, ducks, pigeons, cockatiels, parakeets, parrots, and other birds. Specification: Material: Aluminum Size Chart: Inner diameter: 8mm/0.31inch Height: 10mm/0.39inch Package Includes: 100 Pieces Pigeon Foot Rings Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!