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Whistles for Professionals. The FOX 40 Pealess Whistle is much like a harmonically-tuned instrument, because it produces three slightly different frequencies simultaneously. The different frequencies are superimposed on one another out of phase, and thus alternately reinforce and cancel out each other. The result is a loud, piercing vibrato that has no moving parts to get stuck. The whistle is a plastic-molded injection process that is ultrasonically welded together, rather than glued. Read the inspiring story of Fox40 whistles which all started with Ron Foxcroft, a referee with a whistle problem.

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