This Attwood Safety Whistle is a reliable resource for delivering an emergency signal. This is a ball-style whistle with a ball inside. It is made of a durable plastic and it is bright orange so it's easily seen when needed. It comes with a convenient lanyard so the whistle can be hung and remain easily accessible, or it can be attached to a life vest. This whistle measures 2 ¼ inches x ¾ inches. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.