RWS Chamber Lube is recommended during regular airgun maintenance for use only in your airgun's air chamber to provide long life for your air gun and extended shooting enjoyment for you. Apply 3 or 4 drops of RWS Chamber Lube directly into your airgun's air chamber exhaust port every 750 to 1000 shots. Consult your manual or contact Umarex USA for assistance. Umarex 2167510