I am very pleased with these magnets. They are strong enough to hold photos on the magnetic board, also A4 sheets do not slip. The commonly supplied to the magnetic walls magnets are too weak.
But be careful, you should prevent 2 magnets together, they almost did not get apart again. In addition, quick bursts from the surface. But this is all known to me magnets that.
Conclusion: Highly recommended for the price and purpose.