Double Convex round Lens, Material: Glass, designed for physics and educational uses, Because of their educational use design, there may be minor imperfections that do not affect physical function, for educational uses, Size: 250mm focal length, 50mm diameter and 4mm thick
Mat for the Resonance Bowl The 7in (180mm) round mat can withstand up to 250C (480F).prevent slipping and allows for larger standing waves by preventing vibrations from transferring to the table.