Large optical prism with a base is very convenient to change prism angle. It can be used in science classes at kindergarten, primary school, and high school as demonstration equipment to study the dispersion of light. It can also be used as an educational tool to support children's learning. Features: 1. Very convenient to change prism angle. 2. Can be used for teaching light spectrum physics. 3. Suitable for science experiments involving light spectrum. 4. Precisely cut to provide clear reflections and light separation. Specifications: Material: Plastic base, high-quality optical glass prism Color of Base: Black Size: 8 x 2.5 x 16 cm Weight: 100 g (approx.) Instruction: Place the prism under sunlight. Rotate the prism until the light projects seven colors onto a wall or white paper. Package Includes: 1 x Optical Prism Note: Please note that the new and old versions of this product may be shipped randomly. Ensure you are comfortable with this before placing your order.