Downhole data printing is made easy with Paper Unlimited's 20 lb. Xerographic Prefold Paper with a 8.5" fold. Manufactured primarily for black and white printing with spot color, our 12" X 500' flat pack of 8.5 inch fan fold paper is the premier line of seismic well log media in the country. Paper Unlimited product number FX20B12F812P includes 2 premium 500' flat packs.