• MAGNETS COATED - Ni+Cu+Ni Triple Layer Coated. The Best Coating Available, which Provides a Shiny and Rust Resistant Protection for the Magnets. • POWERFUL MAGNETS - Made of Strongest Magnetic Material! Strong Holding Power, Holding • MAGNETS DIMENSIONS - 60mm x 10mm x 5mm. • DIY PROJECTS & SCIENCE EXPERIMENTS - Refrigerator Magnets, Shower Door, Work or Office, Scientific Purposes, Arts and Crafts or School Classroom.