My friend purchased a batch of magnets from a store called Fornos a few days ago. I heard that they have many different specifications of magnets, and they can also customize them according to your own specifications... Or you can go to this address and ask. No. 17, Huanqu Road, West District, Lecheng, Luocun Lianxing, Nanhai District, Foshan City, Guangdong Province. They are specialized in producing magnets.