Specifications: Using it with iron filings or paper clips can make a magnetic field experiment. Made of high quality materials, the product is very durable, wear-resistant and has long service life. Doing experiments with the magnets can sharpen students' powers of observation and stimulating questions. Item Name: Ring Magnets Material: Magnetic Material Quantity: 2Pcs Product Specifications: 40mm, 32mm Features: Durable, Magnetic, Wear-resistant Product Thickness: 6mm/0.24" (Approx.) Size: 4cm x 4cm x 0.6cm/1.57" x 1.57" x 0.24", 3.2cm x 3.2cm x 0.6cm/1.26" x 1.26" x 0.24" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Ring Magnets