The Square Neodymium Magnet is perfect DIY projects for building all kinds of 3D puzzles. DESCRIPTION: Feature:100% Brand new and high qualityMost popular choice of magnet for applicationsStrong magnetic material to prevent breakingStimulate Brian to become smarterBring endless joy， release pressure or stress from daily life Specification:Material: N35 NdFeBBDimension: 4mm x 4mm x 4mmWeight: 136gNumber��216 PCSColor: SilverSuitable age: Adults INCLUDED:1 x 216 Pcs Square Neodymium Magnets