Plastic. Lanyard string included. Cork ball inside. GI Government Issued type whistle. Contains a small hole at the end to place on neck strap key rings and much more. Pocket size. A must for camping, hiking, fishing, backpacking, military personnel, public safety personnel, and law enforcement personnel. Orange GI style safety whistle. California Prop 65 WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects and other reproductive harm.