Material: aluminum strip SBR foam Function: if a pet with poor eyesight encounters obstacles in front of him when walking, the collision ring will feed back to the pet when encountering obstacles, so as to avoid accidental injury caused by PET collision. Collar and bust dimensions can be adjusted. Product size: S = ring diameter 22CM(for 4-10kg) M = ring diameter 33 CM(for 13-20kg) Using this halo will not affect eating, sleeping or daily activities for your dog. Lightweight and easy to use, the halo is attached to a vest harness, so your dog can wear it easily; and comes with buckles, which can prevent the dog from breaking free. Made of soft fabric and aluminum strip, comfortable for your dogs to wear. Impaired eyesight will dampen the dogs confidence in walking, which will result in the dogs reluctance to move. Using our products allows dogs to walk with confidence and rebuild their confidence. The protection ring is specially designed for dogs with impaired vision, which can protect your dog from collisions with surrounding objects. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!