9 years & up. Introduce your children to a variety of science concepts with this Classic Volleyball for Gym or Outdoor Practice and Collaborative Play. Children will be amazed as they scatter rainbows all over the classroom. This prism is perfect for an interactive discussion about light, color, and refraction! Encourage your children to ask questions about the science concepts they are unfamiliar with. Made of a durable acrylic material. Measures 4" tall.