Fox 40 SHARX Pealess Whistle for Scuba Diving and Water Sport Safety (Black/Black) Fox 40 SHARX Pealess Whistle for Scuba Diving and Water Sport Safety Pealess design, nothing to come loose, jam or freeze 120db of effortless, authoritative sound Made from dual polycarbonate and co-molded elastomer for added comfort and slip resistance House of Scuba is an authorized Fox dealer