Shires Adjustable Pony/Horse Headcollar – Black. Adjustable at the head and nose, this headcollar benefits from a clip-on throatlash. Double layer 1? nylon webbing with brass coloured buckles SAFETY WARNING Please read label and instructions for use before use.Available in a range of colours. This nylon headcollar in 1″increments with brass eyelets and tongue buckles, has an adjustable neck and nose straps, nylon and has a spring loaded clip throatlash.