The Glass Block 75x50x18mm is the perfect size for young scientists to study the properties of light and optics. This rectangular glass block measures 7.5 x 5 x 1.8 cm and is a versatile tool for conducting experiments and learning about how light behaves when passing through different materials. The clear, solid design of the glass block allows kids to observe refraction, dispersion, and other optical phenomena with ease. Whether used in the classroom or for at-home science projects, this glass block is an essential tool for teaching kids about the fascinating world of light and physics. Each block is sold individually, making it easy to purchase the right quantity for any science activity or lesson.