Adjustable yellow silicone cover to prevent dogs from biting. - Color: Yellow - Material: Silicone - Purpose: Prevents dogs from biting - Strap: Adjustable strap Thank you for viewing. For small dogs. I bought this thinking it might be useful if my dog had a barking problem, but he's very well-behaved, so I won't be using it. I am selling it. It is an adjustable strap type.