Quartet - QRT85392 Optimized for use on magnetic glass boards, these rare earth magnets feature a super-powerful design to hold up to six unstapled sheets without sliding. The colorful assortment adds a fashionable pop of color when you post items in your home or office. Smooth, rounded edges help you quickly grab a magnet for easy adjustments. Magnets are perfect for hanging reminders, documents, notes, pictures and more.