14'-23' neck x 6/8' width with strong 100% Nylon fabric. that is soft, smooth, and doesn't easily fade. We follow the AATCC color fastness standard. Machine or hand washable in cold water only. Wash with like colors. The latest multifunctional, double ring design allows for slip functionality. The D ring is basic collar. O ring is slip collar. Remember the D ring must pass through the O ring first. The reinforced stitching is strong and durable. All sewing joints are folded over making them smooth. This allows more comfort to you and your furry friend during use. The multifunctional martingale collar and basic collar are suitable for all breeds of dogs and made for training and daily use. Our quality is guaranteed. If you are not 100% satisfied with the product we will provide customer service, refund, or new product.