Winding/Tail Comb with ruler measurements laser etched onto the comb that will not wear or disappear. The toothed part of the comb is the exact measuring length of a perm rod. The ruler on the tail allows you to measure the exact distance between foils when foiling. Now your assistant can finish your work with the exact ending result. Comb design the same as the YS-101 with exception of the ruler measurements. Perfect for education.