Good mechanism, but the screws (EVERYTHING is fixed with screws inside, an incredible number needed!!!) of the helicopter edges are torn a little bit too tightly. Lubing doesn't help enough. If you buy this puzzle, disassemble it and loosen all these screws about a half-turn. After Reassembling you'll get a perfect puzzle.
Size: edge length: 4cm, height: 9cm
- Helicopter-Dodecahedron Black Body - 333g
- Helicopter-Dodecahedron Ice Green - 338g