This comb is for winding training. The comb is designed with colored teeth representing National test essential values such as 4 cm and 8 cm. for blocking that becomes a standard and habit. The combs color teeth are difficult to peel off and will not stick to mannequin hair. Using the blue and red teeth will allow you to recreate the rod-width, but without the use of a rod to save time. The space from the blue and red teeth to the edge are 4cm(half rod) and 8cm(whole rod). When combing for blocking you can just use the teeth instead of the rod.