T-H Marine - Boating Essentials - Marine & Sport Air Horn - 3.5oz - BE-SA-58212-DP Whether you're celebrating or trying to catch someone's attention, this 3.5 oz, USCG-approved air horn from T-H Marine is a great addition to your boating equipment. Suggested for use on boats up to 65' USCG Approved Ideal for sporting events 3.5oz net weight canister Made in the U.S.A.