Quality Whistles: This set of whistle is made of good quality plastic, very lightweight, waterproof and durable. Double tube design，each whistle can produce high and low frequency sounds. 10 pieces safety and survival whistles with lanyard， it’s suit for team and individual use.
Special design: These survival whistles can be threaded lanyard or directly clipped on the pocket of clothes or wherever you want to clip, its cord can be hanged around your wrist and neck. Double tube design，each whistle can produce high and low frequency sounds.
Double tube design，each whistle can produce high and low frequency sounds. Special Design: The whistles with lanyard are designed with a clip and a nylon cord for securing on your belt or life jacket.The length of the cord can be adjusted freely.
