The ROKR Tractor Wooden Mechanical Gears is an extremely well designed model set with very tight tolerances and good machining. The interlocking mechanisms are pretty intuitive and not overly tight. Assemble without glue and chemicals on details that are already cut and ready to piece together. There is no batteries required; it is simply powered by spring.
Ages: 14+ 135 Pieces. Finished size: 23.8 cm 11.8 cm x 14 cm Approximate assembly time: 5 hours