Collars for Medium Dogs - Width 0.8". Neck 13.8"-18.9". Please make sure leave 2 fingers between the collar and dog's neck (This provides a balance of making sure the collar stays on but not hurting the dog). What's the Collar - Dog collars (Without Buckle) are designed to correct behavior the dogs,it tightens but doesn't choke allowing your dog to learn without harm. Provides gentle control over your pet. Premium Collar Material - Collar is constructed with soft cow leather (delicate hand feel and is comfortable,tough) and stainless steel chain(weld smooth,dense and heavy duty).Well made and durable. Leather Dog Collar - It have delicate hand feel and is soft,light and skin-care, your furry friend will feel comfortable to wear.In addition, leather collar is easy to clean and no smell. After-sales Services - If these are any issues with quality, please send us the email first time, we will provide after-sale policies entitling your money back or new item replacement.