Lightweight aluminum adjustable dog wheelchair, size M. - Type: 2-wheel dog wheelchair - Materials: Aluminum, nylon - Size: M - Features: Adjustable, easy to put on - Suitable dog breeds: Medium-sized dogs Thank you for looking. I am selling this item because the size did not fit my dog after trying it on once. After assembling it, I disassembled it and put it back in the box. (Assembly instructions included) Thank you.