3D Wooden Mechanical Puzzle

Product Description [ORIGINAL ROKR MARBLE RUN] An artwork to be built with your own hands! Traditional wood material, retro waterwheel design. If you want to buy a 3D puzzle, then this classic model kit is the one that you can not miss!   [INTERLOCKING DESIGN] Working in tandem through gears and organs. Turning the hand-crank, the steel marbles will travel along the track from two routes circularly. A vivid case of learning mechanics.   [A TRANSFORMATIONAL GIFT] Our marble run kits make great sensory stimulation toy gifts and STEAM & STEM puzzle gifts for adults and teens. Children under 14 may require assistance to assemble correctly.   [QUALITY THROUGHOUT] Utilizing high latitude selected basswoods. German laser-cut technology makes the error of each piece less than 1/200 mm. Spare parts are contained for accidental damage and loss.   [DETAILED INSTRUCTION] We offer a detailed how-to booklet, featuring easy-to-follow, step-by-step tutorials. Each wooden part is lase