Fred WET MY WHISTLE Slide Whistle Straws, Set of 4 Fred and friends wet my whistle is a straw that works like a whistle, just blow to hear your melodious tunes Everyone loves to blow bubbles with a drinking straw, but Fred and friends wanted more; so we added some tunes To drink, just block the whistle hole with your finger when you're ready to sip Food-Safe polypropylene construction makes the straws fun for kids and safe for mom Each set includes 4 musical straws allowing you to get the whole band together during snack time