Bullet Points:1.Enhance Learning: Our Physics Pulley Set serves as an effective teaching tool, allowing educators to get involved kids in physics experiments and demonstrate the functionality of pulleys in different machines. Experience the principles of mechanics through hands-on learning 2.Adjustable Pulley Fun: Create your own custom pulley setup with our system's range of cassette pulleys. Enjoy easy assembly and user-friendly operating suitable for all ages, for more adjustable fun 3.Rugged Build: With its high-quality metal and ABS materials, this pulley system for kids boasts of good durability, ensuring long-lasting fun and more opportunities for exploration. Rest easy knowing it's safe to use and won't break or deform easily, as it is designed to be strong and wear-resistant 4.Educational and Entertaining: Not only does our pulley system for kids serve as a tool for education and teaching, but it also acts as an exciting toy that provides more entertainment. 5.Nice Present for Kids: Our pulley system provides hands-on learning for kids. Explore the principles of physics and enjoy the excitement of conducting experiments at home, school, or lab. Give the perfect present for any occasion and start a passion for science Get ready to experience the fun of physics with our pulley system for kids! Suitable for all ages, this strong and wear-resistant product is both educational and entertaining. Widely used and simple to assemble, it's perfect for any curious mind.Specification:Product name: Physics Experiments PulleyMaterial: Metal+ABSProduct diameter: about 7cm/2.76 inches, about 5cm/1.97 inches, about 4cm/1.57 inchesPacking List:2 x single pulleys1 x triple parallel pulley1 x triple string pulley1 x lockable triple parallel pulley1 x lockable triple string pulley3 x wireNote:Due to different lighting and screen settings, the item color may be slightly different from the picture.Due to different manual measurements, please allow a 1-2cm difference in size.