The S model has teeth in front and the B is a reverse with teeth on rear blade.
Cutting ratio 15% to 20% depending the angle of the blade. Great Tool for skillful stylist. Turn the thinner towards the head and increase the amount of hair removed. Straight handle design XOT-30 costs less, and is more economical than the XOT-25 that has an offset handle. Both have same blade design, and leave no line.
The ACRO YURAGI 04 removes slightly more hair at 15% but still creates a delicate finish leaving fine blending for a sensitive texture. The Acro Yuragi series has a step-blade which leaves very little demarcation. Acro Yuragi 4 creates a delicate finish and blends the hair.