Puzzle Toys Intelligence Hand Assembly Mechanical Gear Transmission Building Blocks High Difficulty Metal Model, 580pcs Stone Throwing Machine, 660pcs Crossbow, 820pcs Dragon Crossbow, 500pcs Twisted Rock Thrower

1. Alloy material, mechanical device, anti-collision and drop-resistant
2. Can be used as home furnishings after assembly
3. DIY assembly, stimulate logical thinking, improve children's hands and brain ability
4. Parent-child interaction, exercise hands-on ability
5. Physical construction model, difficult to assemble by hand.
6. Smooth edges do not hurt your hands
7. Material: stainless steel