Educational Tool: This pinhole imaging experiment kit is designed to help middle school students exploring and understand the principles of optics in a hands-on manner Sturdy Material: Made from PP, this optics experiment set is built to withstand regular use in classroom settings or at home, ensuring longterm educational value Comprehensive Kit: Includes all necessary components for conducting experiments related to pinhole imaging, making it an ideal resource for both teachers and students Enhances Learning: By engaging with this kit, students can gain practical experience and deepen their understanding of optical concepts through interactive experimentation Easy to Use Design: The components are easy to assemble and use, allowing students to focus on learning without the frustration of complicated setup processes Size Chart: Package 13cmx9cmx4cm/5.12inchx3.54inchx1.57inch Package Includes: 1Physics Optics Experiment Kits Note: 1.This is not infant toy , please take away from children to avoid eating. 2.Please allow slightly errors 1-2cm differences due to manual measurement.