With an extra-strong magnetic core. Under optimal conditions, rare earth magnets can generate up to five times the magnetic force of conventional magnets. Rare earth magnets last longer. The biggest advantage of rare earth magnets is that they retain their magnetic force for an almost unlimited length of time. Conventional magnets lose their magnetic force over time and have to be replaced. Rare earth magnets, however, can be used for significantly longer. The higher purchase price is therefore also put into perspective. Strong core - durable coating. The magnetic core is made from a combination of the rare earth metals samarium and cobalt. These rare earth metals give rare earth magnets their superior properties, but are more expensive. The longer operating lifetime and the superior properties compensate for this higher purchase price. The coating is made from fluoroplastic, thus ensuring the highest level of resistance to chemical substances. Resistant to temperatures up to +275°C.