Gendernot specified unisex shapesphere cylindrical pieces432 materialmagnet metal note3mm magnetic balls 216pcs 2 goldensilver 2 color mixed in 1 box diameter 3 age8 to 13 years 5 to 7 years 14 years up categorymagnetic balls 3d puzzles diy kit science discovery toys educational toy magic prop building blocks magnet toys stress relievers holidaynew year childrens day carnival valentines day birthday christmas net dimensionscm3mm diameter magnetic ball 666 pcs 2 216pcs 2