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3d metal puzzles are suitable for teenagers and adults aged 14+. making a metal model kit is challenging and may take over 8 hours, depending on your speed and patience. you will get a strong sense of accomplishment and stress relief. the metal craft kit is not only functional and interesting, but also beautifully designed great gifts for thanksgiving day, birthday, christmas day, father's day, back to school day. a truly unique metal handicrafts piece on your desks, bookshelves or nightstand. thrill the entire family and provide fun and entertainment piecing this diy metal puzzle model kit together. building this 3-d puzzle models can be worthy for the family to complete together. and it will inspire and promote your child's ability to plan and build structure like a real architect..syi