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DIY wooden homemade track rollerball (difficulty: ⭐⭐⭐⭐).
Multi-gear linkage infinite loop, multi-layer track in parallel, order movement scientific decompression, gravity traction steel ball. 4 stars for assembling difficulty.
No screws fixed, all assembled.
Decipher the left brain thinking code, find the missing concentration. The assembling process trains logical thinking, concentrates attention and feels the pleasure of brain collision.
High-quality wood, environmentally friendly and unpainted.
Assembly size: 210*160*180mm
