Push-pin shaped magnets keep notes, schedules, and reminders in plain sight. Use on any metal surface such as white boards, lockers, refrigerators, and more. Colorful, attractive, and fun. Made with Neodymium (Nd-Fe-B), the most powerful magnetic material in the world. Super holding power, despite their small size. Good in ambient temperatures up to 176 degrees F. Ideal for home, office, and school. Post memos, important reminders, drawings, and photos.