The 3D puzzle bundle is perfect Gift easpecially in holidays like Christmas. We select favorite picks Marble Run Model Building Kits and Illuminous Music Box Globe by customers for you and your family. The plywood are sturdy and pre-cut by laser. So it was smooth to fit. But some parts are delicate and need your attention. Comes with detailed instruction and almost everything you need. A bit challenging but really worth your time. Giftable 3D wooden puzzles for adults and kids at special events like birthday, anniversary and Christmas. Best gift choice for Diy lovers and who loves mechianics.