The 3D Metal Model Is Very Precise And The Assemble Time Last From 30 Minutes To Several Hours Due To Their Complexity Of The Models. So Please Pay Enough Patience For Your Assemble Thanks To The Ingenious "Slot-And-Tab" Design， Fasteners or Glue Will Not Required To Build Metal Works 3D Sculptures. All You Need Are Your Hands! Simply Pop Out The Pieces And Bend， Fold And Assemble Them Using The Included Illustrated Instructions Feature Material : Duplex Stainless Steel Mirror Laser-etched Assembly Time : Around 15-30min Recommended Ages: 14+