NGK Group (formerly NGK Insulators, 日本ガイシ) is a company that manufactures and sells industrial ceramic products, electric power equipment, electronic components, and special metal products. Its offerings include insulators, hollow insulators, diesel particulate filters (DPFs), NOx sensors, ceramic heaters, piezoelectric actuators, lithium-ion rechargeable batteries, and beryllium copper products. The company serves automotive, electronics, industrial, medical, and aerospace-related markets.