10PCS Magnetic Nail Office Calligraphy And Painting Refrigerator Strong Magnet Nail Teaching Whiteboard Magnetic Nails 12x16mm product size：12X16mm Product list: 5/10pcs magnetic nails Uses: Office teaching use Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1mm.