Made of plastic, ensuring long-lasting use and stability during experiments. The Galton board demonstrates the principles of probability and statistics through a hands-on experience. The transparent acrylic panel allows for clear visibility of the ball's path and the resulting distribution. Accurately measured steel balls enhance the of the probability distribution observed. Ideal for educational purposes, making complex statistical easy to understand and visualize. The Galton board is a fascinating educational tool that illustrates the concept of probability distribution through a simple yet effective design. As balls drop through a series of pegs, they randomly choose to go left or right, ultimately landing in a grid below. This process visually represents the binomial distribution, and with a sufficient number of trials, the results converge towards a normal distribution. The clear acrylic panel and precisely crafted steel balls an excellent resource for teaching statistics and probability in an engaging manner. Color: Black Material: plastic Package Contents: 1*Galton Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.