Features: Light your child's creativity and scientific curiosity with the 3D Linear Servo accessories set, offer fun hands-on learning experience. Crafted from plastic materials, safe and easy to assemble, making it perfect for beginners in science projects. Suitable for children aged 6 and up, this set encourages collaboration between parents and kids, enhancing family bonding through shared activities. Perfect for home based parent child interactions, school science experiment, or technology club activities, providing endless educational fun. This educational toy not only fosters problem solving skills but also introduces basic principles of physics and engineering, making it a valuable addition to any little scientist's collection. Specifications: Component:Plastic Size: Approx.87.96mm/3.46inch Type: 2 Option Package Includes: 1 Set Linear Motion of Servo Motor Accessory note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.