Features: The J22220 dalton Board demonstrates statistical distribution through cascading steel balls forming visual bells curves, making it essential physics teaching aid for visualizing random phenomena. Crafted with plastic and engineered components like staggered nails, V shaped grooves, and shock resistant channels, this dalton Board demonstration model ensures long term durability for repeated classroom experiments. Suit for educators, STEM students, and physics enthusiasts, this interactive tool bridges theoretical concepts with hands on learning for ages 12+ in academic or hobbyist settings. Widely used for classroom demonstrations, science exhibits, or interactive study to explain probability models, and normal distribution principles. Combining educational value with sleek designs, this compact dalton Board doubles as intriguing desktop display and thoughtful gift for science lovers, blending functionality with aesthetic appeal. Specifications: Component: Plastic Color: As Picture Shown Size: Approx. 42x32cm/16.54x12.6in Weight: Approx. 300g Package Includes: 1Piece Physics Teaching Model note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color