Description: DIY pendulum science experiment assembled model kits - educational scientific toy Exploring the working principle of the timepiece model for physical mechanical gear learning. Pendulum system is driven with a -way ratchet and gear train to achieve minutes and seconds switch. Model Building Kits - assembly the science model step by step through the instructions, to be a little inventor. Develop children's hand & eye coordination, and help children experience the of power, expand kids scientific & physics interest. Great scientific experiments lab teaching aids school suppliesCool designed DIY scientific toy gifts for kids Material: Plastic ColorAs picture show Specification: Need to be assembled by yourself and assemble the model as the pictures shown Size Chart: Assembled size (L*W*H): Approx 13.5*9.5*19.1cm/ 5.31*3.74*7.51 inch Package Includes: 1 Set DIY Pendulum Assembled Kit Toy