Newton's second law: Nonlinear Curve Fitting Design derived from Newton's second law , simulating the experimental scene, exhibits science and aesthetics together. The interior part is Carved and curved paper. Double-sided glass transparent, Ultra thin glass, high transparent, and not easy to break, for protecting the safety of you and the people around you. **SIZE：**(H x W x D) 12 cm x 12 cm x 3 cm **MATERIALS：**Paper、Wood、Glass **CARE INSTRUCTIONS：** 1. Wood products should be stored in a dry and well-ventilated place. A humid environment may lead to termite infestation. 2. Please use a dry and soft cloth for cleaning wood products. 3. This product is handmade, and so may not look exactly the same as the photo. 4. Please allow for some variation in color as displayed on different devices and screens. Actual colors may vary.