It is a DIY spring scale, which can exercise your children hands-on ability, train your children observation capability, thinking and analytical skills. Bright colors will appeal to children and let them learn with fun and enjoyment. It is made of plastic material, which is and lasting for use. Features -Color:Blue -Material:Plastic -Size:13.00X3.00X0.50cm/5.11X1.18X0.20in - Made of premium plastic material, not easy to damage, safe and , useful and interesting. - Manual assembly model, which will help your child's developmental skills and learning minds. - You can send it to your families and friends as a present, they will be happy for this creative and practical diy spring scale. - Also, an experiment and teaching model, your kid study science, fun learning. - It is perfect for classroom and school for measuring weight and exploring the physical principles of force and mass. Package list: 4 sets x spring scales