Square edged A + AB grade ( No knods , no defect , only 10-15 % health red heard / one side = China quality ) , beech timber , steam, KD 10 %
Quality GRADE A1/ A2 ( Quality : Small sound or dead knots < 7 mm are not considered. Tolerance of 1 intergrown knot per side with a diameter up to 8 mm. Knots clusters, through or dead, are not permitted.)
