Denman Pro Edge lefty comb blue. The Denman ProEdge - designed by Roger Wigmore - is the ideal tool for Precise Cutting. The ProEdges unique cutting ledge is the key to fast and accurate scissor-over-comb and clipper-over-comb cutting. The ledge helps to accurately position the scissor - clipper for a smoother, steadier cut and helps prevent the scissor - clipper from slipping. The ProEdge also helps to improve the posture of the stylist - barber and is known to reduce fatigue.