Y.S. Park White ys-g45 cutting guide comb with a Ruler for the national examination. The ruler's measurements are laser etched onto the comb to keep the Ruler from disappearing. This is a cutting guide comb is perfect for absolute precision cutting, there is an indent on the top of the comb providing you with the exact 90 degrees of the scalp. This is perfect for students or those who do The precision cutting. Round teeth to mimic human fingers which minimises damage and keeps even tension at all angles.