21st Century"s Fiberglass Kerosene Heater Wicks are made of graphite coated fiberglass, a re-inforced cloth band and the highest quality cotton. Wick Model 117 fits Keroheat OR-77, OR-78, BT1000, Sanyo OHRG-25A, Sengoku OR-77, Yuasa J10 and more. Contact us for a free cross reference chart..