Features: Safe Material: Made of high-quality acrylic material, durable and lightweight, easy to clean. Multi Sizes: Three different sizes, perfect for all kinds of birds. S fits for Budgerigar, Bismarck Finch, Lovebird, Barred Parakeet, Cockatiel; for M fits for Red-breasted Parakeet, for Sun Parakeet, Plum-headed Parakeet, for parrot; L fits for Alexandrine Parakeet, Sulphur-crested Cockatoo (medium & large Size), Cacatua alba, Macaws (large size). Bird Recovery Collar: There are many reasons for why parrots bite feather, dissatisfied or lonely all may cause they hurt themselves. Our bird recovery collar effectively prevents birds from pulling the hair out of their body. All Day Protection: Lightweight, stress free and comfortable for your pets to wear. Help overcome lick-bite, itch-scratch cycle and end self-inflicted wound aggravation or mutilation. Wide Applications: Great for recovery from injuries, rashes and post surgery, could be one best gift for your friends or family. It also can be used in bathing, trimming the nails and other grooming occasions for birds. Specifications: Material: Acrylic Color: Transparent Size (Approx.): S: 3.5x4.8cm/1.38x1.89in, I.D. 3.3cm/1.30in M: 4.3x7.2cm/1.69x2.83in, I.D. 3.5cm/1.38in L: 5.5x9.5cm/2.17x3.74in, I.D. 4.5cm/1.77in Weight (Approx.): S: 52g M: 58g L: 65g Package Includes: 1 Piece Bird Recovery Collar (S/for M/L) note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!