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?[ROKR Wooden Marble Run] This classic wooden marble run is great for collection.Traditional wood material,retro waterwheel design.It takes 5-6 hours to build and is a wonderful 3D puzzle for adults and older kids. | ??[Full of Details] Working in tandem through gears.Turning the hand-crank, the metal marbles will travel along two tracks.You can see multiple parts working together in this process.It will take your puzzles game to the next level. | ??[Impressive Gift Idea] 3D wooden puzzles are not common,but suitable for people of all ages.With its attractive design, it makes a great home decor item and an ideal gift for adults or men & women who love puzzles. | ??[Quality Assurance] Utilizing high latitude selected basswoods.Our laser-cut technology makes the error of each piece less than 1/200 mm.Spare parts are also included,so you don't have to worry about breaking any part. | ??[Instruction] We offer a detailed how-to booklet for this 3D puzzle,featuring easy-to-follow,step-by-step tutorials.Each wooden part is laser marked with a unique code.A suitable adult wooden model kit for beginners. | ??[Service] ROKR offers free replacement of damaged parts.If there is any problem, we will help to check and provide guidance.Just contact us and we will reply within 12h.

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