Review on POPLAY Beautiful Marbles Multiple Whistle: Versatile Sound Maker for Kids and Adults by David Moreno

Good set of cheap small balls. They're small, mind you. But they did not differ in a variety of colors. Most of mine were clear/cloudy grey. Almost all had wrinkles in the glass. So they weren't entirely smooth. Only two shiny bluish ones were cracked, which annoyed me. That being said I have 53 balls and for the price they are perfect for my kids.