Rm series resistors belong to carbon film or metal film.

Carbon film. Rm series resistors belong to carbon film, and are compared with resistors. RM carbon film resistor has soft and meticulous sound, warm timbre and soft sound quality. Carbon film resistor is a kind of thin film resistor. It is made by using high-temperature vacuum coating technology to tightly attach carbon to the surface of porcelain rod to form a carbon film, then adding appropriate joints to cut it, and coating epoxy resin on its surface for sealing protection.