Comb Blade Geometry

Comb Blade Geometry (クシ刃の形状)

Quick look

• What it is: The internal shape of the grooves between teeth on a thinning or texturizing scissors
• Three main designs: V-groove (V溝), Stepped (段刃), Flat/grooveless (フラット/溝なし)
• Impact: Determines how hair is captured, held, and released during each closing stroke
• Selection principle: Match comb geometry to desired feel and finish quality

Why it matters

The comb blade geometry controls the cutting sensation and the quality of the finished result. Two thinning scissors with identical tooth counts and rates can feel completely different in use and produce different blending quality, all because of the groove shape between the teeth.

V-groove (V溝, V-mizo) — Traditional, precise, firm sensation. Each groove is cut in a sharp V-shape that channels hair to the base of the tooth before the cutting blade engages. This produces a firm, definite cutting sensation and very precise, controlled removal. Hair is held securely during the cut, minimizing slip. The traditional design found in classic Japanese thinning scissors. Best for stylists who want tactile feedback and predictable results on each stroke.

Stepped (段刃, dan-ba) — Modern mainstream, soft blending. The grooves feature a stepped or terraced profile that allows hair to sit at different depths within the tooth. This produces a softer cutting sensation and more natural-looking blending because hairs at different positions within the groove are cut at slightly different lengths. The dominant geometry in modern professional thinning scissors. Produces the least visible demarcation lines, making it the preferred choice for seamless blending work.

Flat / grooveless (フラット/溝なし, furatto / mizo-nashi) — No grooves, low rate, texture-only, soft subtle feel. The teeth have smooth, flat surfaces with no internal grooves. Hair rests against the flat face of each tooth and is not channeled or gripped before cutting. This produces the softest, most subtle cutting sensation and the lowest effective cut rate of any geometry. Designed for finishing work where only the most delicate texture adjustment is needed. Produces an extremely natural, invisible result.

Comb blade geometry interacts with tooth count, tooth spacing, and tooth tip profile to determine the overall character of a thinning scissors. Changing any one of these factors shifts the behavior of the tool. When selecting thinning scissors, consider the geometry alongside the published cut rate for a complete picture.

Related: Thinning Rate Guide

Blade Orientation (正刃 vs 逆刃)

Tooth Tip Profiles

Sources

1. Japanese thinning scissors comb blade manufacturing specifications
2. Professional thinning scissors selection and comparison guides