The delivery was very well packed and arrived quickly. The bonding surfaces of the magnets were coated black and unfortunately rubbed off on my paper. The magnets attracted "pencil" -farbige stripes on my white paper. The magnets, which I had previously not rub off. Additionally, the actual holding force of this magnet size is clearly too weak. Mir is not clear how the 1500g to be held. I sent back the magnets. It took a few days until the money came back, but friendly inquiries were answered as friendly and then the money returned.