"First of all, I have 11 of these magnets that I use in my elementary classroom. They are a hit with the children. The magnetic force is very strong as well which is why I really like them. Even though they are a bit pricey, even at a discount, they are strong enough to hold up the heavy chart papers I use in the classroom. Here is the "but" part. My Iron Man magnet would come off the actual magnet part because the force of the magnet was too strong. I would pull the magnet but the magnet would remain on the surface while the plastic would detach from it. I thought I just got a rare flaw. When I got this Yoda magnet, the same thing happened just a week after using it. The magnetic force is strong but is not THAT strong that it should be stronger than the adhesive that keeps it attached to the plastic. This happening to 20% of my magnets seems like a high number, especially considering the cost."