These magnets from Somasix really are strong enough to not only stick on the refrigerator but hold up heavy art paper and photo paper too. Lots of fun to make crosswords or just simply practice spelling words have your kids practice their names, phone# and addresses with the numbers magnets and lowercase kits too, we have them and they have been great for math homework while I am cooking and just fun. Leave riddles or math problems for next person to go in the fridge. Highly recommendable! I obtained this item for free in exchange for an unbiased and honest review. Regardless the opinions found herein are based on my experiences with this merchandise.