Available in three grades: Prime Grade, Character Grade, and Rustic Grade. Prime Grade has minimal color variation, mainly clear boards, occasional sounds knots up to 1” diameter, and no sap permitted. Character Grade has minor color variation, knots filled up to 2 1/3″ diameter, and occasional sound hard sap on edges permitted. Rustic Grade has color variation/red allowed, filled unlimited knots, occasional boards with worms, and occasional sound hard sap on face area.