Fox 40 Classic Official Referee Whistle with Finger Grip Full size original "classic" Sonic whistle with finger grip No moving parts to freeze, jam or deteriorate 115 Decibels of high pitch shrill rises above ambient noise-can be heard up to a mile away 100% constructed of high-impact ABS plastic-So they're 100% impervious to moisture First Choice of; NFL, NCAA, NBA, CFL FIBA and FIFA