Every kit in this collection has moving parts — that's what separates the Mechanical range from the rest of the Robotime catalog. You'll find marble runs , music boxes , kinetic clocks, scale models, and mechanical creature builds. Materials vary by kit and are worth paying attention to when choosing: most builds use laser-cut wooden parts as the structural base — precision-fitted, no glue required; metal components appear in the more complex mechanisms and are what give the moving parts their durability and satisfying weight; and colored acrylic panels show up in select kits — adding a translucent visual layer that wood alone can't deliver.
Source: https://www.robotimeonline.com/collections/mechanical