About This [ROKR TOWER COASTER] Tower coaster has a more dynamic shape，it is highly praised in the ROKR marble run series.As long as the handle is turned, the unique mechanism can transport marbles from bottom to top in an orderly manner. [INTERLOCKING DESIGN] Working in tandem through gears and organs. Sanding the gears with sandpaper and wax it will make the model kit rotate more smoothly. [A CREATIVE GIFT] Our marble run kits make great sensory stimulation toy gifts and STEAM & STEM puzzle gifts for adults and teens. [QUALITY THROUGHOUT] ROKR utilizes industry-leading technology to produce best 3d wooden puzzles.All pieces are laser-cut and the error is less than 1/5000 inch,make sure each part fits tightly. [DETAILED INSTRUCTION] We offer a detailed how-to booklet.It will take about 6 hours to build up this 3d puzzle for adults. [SERVICE] ROKR offers replacement of damaged parts.If there is any problem, we will help to check and provide guidance.we will reply within 12h.
