Niterra Co., Ltd., together with its subsidiaries, manufactures and sells spark plugs and related products for internal-combustion engines and technical ceramics in Japan and internationally. The company offers spark plugs, including plugs for aftermarket and original equipment, igniter plugs, and resistor cables and covers; glow plugs comprising ceramic and metal type glow plugs, and glow controllers; and oxygen, NOx, temperature, and knock sensors. It also provides semiconductor packages used in all kinds of products, including smartphones, cameras, and cars, as well as manufacturing parts for semiconductors, and medical products. In addition, the company offers fine ceramics, balls for bearings, piezoelectric ceramics, other industrial ceramics such as plungers for pumps and ceramic protective plates, including wear-resistant parts, ultrasonic transducers and sensors, products for semiconductor manufacturing equipment, electric equipment products, and other ceramic products. Further, it provides cutting tools comprising ceramic, micro grain carbide, coated carbide, and cubic boron nitride grades, as well as SS and rotational tools; and sumikaze, a sterilization deodorizer utilizes ozone to purify the air and inhibit invisible harmful substances and viruses. The company sells its spark and glow plugs under the NGK brand; and sensors, semiconductor packages/substrates, cutting tools, oxygen concentrators, and piezoelectric and fine ceramics under the NTK brand. The company was formerly known as NGK Spark Plug Co., Ltd. and changed its name to Niterra Co., Ltd. in April 2023. Niterra Co., Ltd. was founded in 1936 and is headquartered in Nagoya, Japan.