Technically superior to all other brands! Fox 40's only silver metal whistle with a powerful lower tone. Lead-free. Developed for any sport, with a traditional lower tone. Whistle includes a removable CMG. The SuperForce Glovegrip uses extended Velcro straps to secure around a hockey glove. Protect hands. Easy whistle access. Developed for coaches and training. Design: Moisture-resistant sound ball. Sound Power:: Developed for any sport, with traditional lower tone.