Technics: The product is made of good material, nothing to say about that. However, the strength of the magnets is very low and inefficient; it easily detaches from metal structures and can hold less than 1.5 kg of weight. It would be great if you could increase the number of magnets in the bag to 3 or 4 to improve the attachment strength to metal surfaces. Overall, the product is good, and if you put less than 1.5 kg of weight, it fulfills its function.