Plastic The Sharx is the newest addition to the Fox 40 world class whistles. The Sharx is effortless to use to reach an extremely loud and high pitched sound that can be heard miles away. Made from durable polycarbonate and co-molded elastomer for added comfort and slip resistance. Specifically designed to perform in the nastiest weather conditions! Each whistle comes with a black break away lanyard. Available color combinations: black/black; orange/blue; neon/grey; purple/green; white/grey; red/red; green/green; yellow/blue