The training whistle is made of plastic whistle and stretchable coil and alloy key ring. Expandable plastic spring wrist coil fits most arms. Built to last and handle any accessory you need to carry with you on a daily basis. Great for coaches, emergencies, safety, lifeguarding, sports games, hiking, kids party favors, goodie bag fillers and more. Orders of 10000 pieces or greater are eligible for sea shipping. 100% guarantee for quality.