Overhaul kit include: Oil seal series, Sealing gasket series, Teflon series, Sealing ring series... 1. Oil seal series: NOK & CORTECO NOK: One of the biggest sealing products manufacturer leader in sealing industry in the world. Some are packed with CORTECO bag. 2. Sealing gasket series: 100% Asbestos_free. Produced in Inerface solutions INC. *air tightness *compressiblity *chemical corrosion resistance *deformation resistance *rebound resistance *Non-corrosiveness *sticky resistance *temperature resistance 3. Teflon series: Made in America TTK and Taiwan. 4. Sealing ring series: Made of VITON rubber from Japan & AEM.