The lot you are purchasing contains: 200 Circular Magnets These magnets are black and they measure 1/2 inch in diameter and are 2mm thick. These magnets are so useful! They have a peel off backing for you to stick to things, or you can apply glue for a better hold. They are lightweight, not heavy duty. Perfect for arts and crafts, holding lightweight papers together, etc. Great to hold your children's test on the fridge, or an important bill or document you don't want to forget about!