Red Hills Lumber Select heart pine flooring is graded for 80-100% heart and is sawed from the base logs of selectively harvested mature longleaf pines. It is similar in heart content and growth ring density to the heart pine harvested in the late 19th and early 20th centuries that makes up much of the reclaimed timber market today. Many boards are completely clear, while some boards have infrequent small knots. It is primarily flatsawn, but may contain occasional quartersawn boards.