Robotime mechanical wind-up clock timer Pendulum Clock that can actually work! A stylish spring-driven wooden clock with absorbing buidling experience. Put the mechanism together and watch how it works. Lovely gift for a wide age range. A gravity-swing pendulum with precise anchor escapement. Gift for mechanical lovers or family friends at any occasions like birthday or Chirstmas The boards are all laser precut, simply take the parts out from the plates. It's so easy to assemble, with no glue required. 3D puzzles make great gifts or projects for those who like to test attention to detail, follow instruction and gain a really smart display piece upon completion. Fun and challenge at the same time. Be fascinated by the function of the toothed gears and experience how energy is generated and converted into kinetic energy. A wooden 3D puzzle is not a toy for children, it is a highlight for the whole family. And best of all - you create your own 3D puzzle. No glue, no screws. Laser-cut wooden parts, marbles, sandpaper and detailed assembly instructions will help you. The 3D wooden puzzles were designed and manufactured with great attention to detail. Each object is a small work of art. All models promote your creativity, train your hand-eye coordination and your dexterity or are just fun and bring a lot of relaxation. Fascination for the whole family. Rcommended age: 14 years+