Finger joint worktop quality as follows: MC in 8%-10%. finger jointed allowed in length, lamellas length 200mm and longer random but end of lamellas allows shorter than 200mm, lamellas width 40mm+/-2mm and one edge of stave allows less 40mm. A face, allows pin knots up to 5mm in diameter ,No sapwood . no defect allowed, don't allow have off color,no rotten ,no insect attack ,no black string,no mildew,no crack and crush or any other defects B face, allows sound knots up to 25mm in diameter, some sapwood but evenly distributed ,no other defect allowed. other is same to A face Both face sanding 180grit.