This 3D metal puzzle building kit is suitable for teens aged 14 and up. Its military-style design and precise specifications make it a perfect brain teaser that appeals to both boys and girls. With a difficulty rating of 5 stars, this puzzle is sure to provide hours of challenging and rewarding fun. Made from stainless steel, it also serves as a great stress-relieving activity and helps develop hand-eye coordination and critical thinking skills. Compared to traditional wooden, paper, and plastic models, 3D metal models are more valuable for collecting. This puzzle also makes a perfect gift for adults and kids on special occasions like Christmas, New Year, birthdays, or Thanksgiving. Please note that assembling tools are not included, but can be purchased separately from our store. You can easily detach the parts from the sheets and use tweezers or hair clippers as recommended tools for bending and twisting the connecting tabs.