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Signal whistles made of silver-plated metal, set of 2 When blowing in, the cork ball vibrates inside and a shrill and loud sound is produced Whistles with removable blue cord that attaches to the whistle with a carabiner Can be worn around the neck or wrist thanks to the strap, so it is always within reach and does not get lost Classic accessory for coaches and referees, as well as for sports teachers.