It can be used for student teaching, classroom presentations, etc. Made of high quality materials, the product is very durable, wear-resistant and has long service life. You can learn the basic physics principles and investigate the physics and magnetism by doing experiments with the magnet. Item Name: U-shaped Magnet Material: Magnetic Material Product Specifications: 100mm, 80mm, 60mm, 40mm Features: Durable, Magnetic, Wear-resistant Product Thickness: 30mm/1.18", 22mm/0.87", 10mm/0.39", 6mm/0.24" (Approx.) Size: 10cm x 8.5cm x 3cm/3.94" x 3.35" x 1.18", 8.5cm x 8cm x 2.2cm/3.35" x 3.15" x 0.87", 6.5cm x 5.5cm x 1cm/2.56" x 2.17" x 0.39", 4.2cm x 3.6cm x 0.6cm/1.65" x 1.42" x 0.24" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x U-shaped Magnet