Advantage Trim and Lumber offers a wide range of hardwood flooring. The unfinished tongue-and-groove flooring is kiln-dried to moisture content ranging between 6% and 8%. Choose from four grades: Clear, mostly heartwood and largely uniform in appearance; Select, knot-free but with some color variation; Natural/Common, with some color variation and pin knots; and Rustic, with larger knots and color variation. 877-232-3915, AdvantageLumber.com.