Children's Crafts - 40-piece set, suitable for beginners. The set size is 35x23 cm. It includes 15 types of gears, such as worm gears, bevel gears, worm screw gears, and rack gears. Comes with a detailed manual. Suitable for ages 8 years and up. The set includes various types of gears for experimentation and multiple combinations. Materials: ABS, PC. Dimensions: 35 cm x 23 cm. Weight: 1.3 kg. Includes 2 gears of type (P and T).