Features: 1. Made of acrylic, sturdy and durable, easy to wear. 2. Recovery collar, are ideal as additional protection for healing wounds of medical surgery or treatment. 3. Useful training aid, avoid the parrot usual plucking of feathers. 4. 3 sizes available, easy to get what fit for your pet. 5. Normally, the large extension side is down, but sometimes it can happen that the parrot can still pluck its feather, so you can turn your head on the direction that can help you solve this problem well according to our experience! If all of the above cannot solve the problem, we suggest you buy a larger piece. (6.1 inches) as a CD, which can be connected to this collar for use. Specifications: Item type: Bird Neck Cover Material: Acrylic Color: transparent Optional Size: S, M, L Size Outer diameter(cm/in) Inner diameter(cm/in) Length(cm/in) S 4.8/1.9 3.3/1.3 3.5/1.4 M 7.2/2.8 3.5/1.4 4.3/1.7 L 9.5/3.7 4.5/1.8 5.5/2.2 Packing List: 1 x Parrot Neck Collar 4 x Screw Usage guide: 1. Take off the screw 2.Divide the necklace in half (the large extension side is down) and buckle on the parrot's neck, Be careful not to hold feathers in the middle of the collar. (You can gently drag the parrot's neck to extend it so that it fits more closely and please pay attention to the strength of your hand and it will be better for two people to work together to finish this process). 3.Wash down the large side, taking care not to clip the feather between the collar. 4.Put your little finger between the neck and the neck of the parrot to check if the collar is too loose or too tight If your little finger feels comfortable, this size is suitable for the parrot, then tighten the screws. 5.Insert the two screws into the collar separately. 6.Turn the collar 360 degrees to make sure the pen does not catch and that the neck moves easily. Special note: 1. Put the bird in a cage without obstacles 2. Most birds will be clumsy heads, most of them will shake their heads and flip their heads in an attempt to get rid of the collar. Most birds will gradually adapt after wearing for a few hours. However, some birds may stiffen their heads and continue to lower their heads for 12 to 24 hours. .