This DIY Hand Generator science experiment toy set is perfect for children who and hands-on activities. The Hand Generator model is a great way to teach kids about gravity and how it affects the movement of objects. This is a fun and educational toy that will inspire children's interest in science and technology. Features -Color:Green -Material:ABS and Metal -Size:5.50X4.00X4.00cm/2.16X1.57X1.57in (without operating crank) -Encourages children to think creatively and develop problem-solving skills. During the DIY process, you can relax yourself and increase your hands-on ability. -Provides a hands-on learning experience about the concept of gravity and how it affects movement. -Our DIY science kit is perfect for kids interested in electronic and engineering projects. That’s a great way to build a good parent-child relationship, also perfect for elementary classroom projects. -Combines fun and education, serving as a science experiment puzzle toy. -Sparks children's interest in science and technology. Stimulate your child's interest in learning and lay the foundation for learning. Suitable for hands easily assemble. Package list: 1 x Hand Generator diy material