Reusable Polypropylene Pneumatic  Operating  and Consulting Otoscope Specula * 4 mm * The material used in the Welch Allyn Reusable Polypropylene Specula is lightweight but durable * The specula may be autoclaved  boiled  or sterilized in solution and can be attached easily *  Shipping Carton Size: 12 L x 10 W x 6 H