Slide Whistle - Plastic Great sound effect! Make your color choice at our drop down box. Slide whistles are tons of fun for most anyone of any age. Even small children can play a slide whistle. You simply blow on the whistle and then as you slide the ring back and forth the pitch changes. Watch how fast it puts a smile on children and most anyone using it. These are available in several colors including red, purple, blue and yellow. Make sure you have a few extra as more will want to join in on the fun.