Manufactured from modern materials for strength and salt water tolerance. Consist of two marine stainless steel spit rings. A black coil. The waterproof safety whistle quality Nexus (No Pea, No Jams) is bright orange and ideal for all watersports including Scuba diving. Also an excellent whistle for walking, hiking etc. Extremely loud and easy to blow when cold / wet and capable of producing over 100 decibels of sound. This quality nexus whistle meets the new safety standard ISO 12402-8. Please check out our other whistles we have a good selection.