NdFeB block magnet https://www.zhijiangmagnet.com/

Alnico block magnet are usually used in educational facilities from elementary school to graduate work, and have a wide range of experimental applications. Compared with neodymium and ferrite magnets, AlNiCo magnets have higher residual induction, so they are still very sensitive to demagnetization. Alnico magnets are the weakest permanent magnets, but they have excellent temperature stability and very good corrosion resistance. Their mechanical strength is greater than neodymium or ferrite magnets, because AlNiCo magnets are hard and brittle.