• Portable size: Each strong magnet measures 16 x 12 mm, easy to hold, carry, and store. • High-quality material: Coated with 3 layers of black nickel to protect against rust and corrosion. • Extra strong neodymium magnets: Can hold up to 24 sheets of A4 paper. • Multi-purpose magnets: Perfect for notes, photographs, and posters on magnetic surfaces. • Leaves no marks or stains when removed from whiteboards, refrigerators, or iron products.