Little Treasures Rock Tumbler Helps Children Learn The Power of Nature! Discovering the awesome power and beauty of nature is something that every child should have a chance to experience. The Rock Tumbler is a toy that most children will enjoy for years and years. Designed for children who are aged 8 years and older. Our Little Treasures Brand brings to the market interesting scientific projects to learn about the beauty of nature. The Little Treasures Rock Tumbler is one way that children can learn about erosion, and the power of wind and water.