These colorful, strong magnets work well on all magnetic surfaces. From filing cabinets, magnetic whiteboards to most metal surfaces. Powerful magnets hold securely. Assorted colors and sizes for extra organization. Each tub includes 12 small, 12 medium and 6 large magnets. Assorted colors include: blue, green, red, white and yellow. Sold as 6 packs for a total of 180 magnets.