Ferrule size is important to makeup brush function

 The ferrule size of a makeup brush directly affects the density, elasticity, and brush shape of the bristles. This article briefly analyzes the different ferrule sizes and compatible brush types, which can help brands and users accurately match needs during OEM makeup brushes and purchasing.

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►Core parameters and functions

Inner diameter: determines bristle fluffiness and powder collection area.
Length : affects bristles support and elasticity .
Shape: round, angled, special-shaped mouth, corresponding to different brush types.

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►Ferrule sizes and brush types

Inner Diameter（mm）	length（mm）	Applicable brush type	Features	Representative Products
3-5mm	8-12mm	Detail Eyeliner Brush	Tight and dense brush head, precise lines	MAC 210S
6-8mm	10-15mm	Pencil brush	Small area coloring, suitable for  triangle area at the end of the eye	Hakuhodo B005G
9-12mm	15-20mm	Medium Eyeshadow Brush	Evenly take powder and quickly apply base	Sigma E25
13-18mm	20-25mm	Stippling blush brush	Loose brush head, natural smudge	Qingzhi G081
19-25mm	25-30mm	Tongue shape foundation brush	High-density bristles, polished without marks	Artis Oval 7
26-35mm	30-40mm	Round powder brush	Fluffy powder, full face makeup	Chikuhodo Z-9
Angled/special shape	15-25mm	Fan brush, nose shadow brush	Fits facial contours for precise contouring	Sonia G. Sculpt Three

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►Key parameters and selection guideline

1. Inner diameter determines function

＜5mm：Ultra-slim, suitable for precise lines (such as eyeliner and concealer).
6-12mm：Universal eyeshadow brush range, choose tightness as needed (the larger the inner diameter, the fluffier)
＞25mm：Large powder brushes need long ferrules (30mm+) to improve the bristle elasticity.

2. The ferrule length affects the support force

Short (＜15mm)：Stiff bristle, suitable for cream products (such as concealer brushes)
Long(＞25mm)： Soft bristles, suitable for powder blending (like a blush brush).

3. Shape and brush type

Round: basic all-purpose (such as loose powder brush, eye shadow brush).
Angled: fits the curve of the face (such as angled contouring brush).
Flat: precisely controls the range (such as tongue-shaped foundation brush).

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►Process and Pitfall
Stamping:

Integrated stamping ferrule (no welding seam) is more durable, representative brands: Hakuhodo, Chikuhodo .
Low-priced brushes often have welded ferrule, easy to crack and hair loss
 

Copper ferrule vs. aluminum ferrule:

Copper: high cost, strong corrosion resistance (preferred by professional brushes, such as Wayne Goss).
Aluminum: lightweight, suitable for portable brushes (such as Real Techniques).

Hair bundle fixing:

Epoxy resin glue: environmentally friendly, but poor water resistance (avoid frequent soaking and cleaning).
Metal rivets: high-cost, representing top-level handmade brushes (such as Smith Cosmetics).

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►Typical products

Brush Type	Ferrule inner diameter	Ferrule length	Material/Craftsmanship	Brand Model
Detail Eyeliner Brush	4mm	10mm	Copper ferrule + epoxy resin glue	Hakuhodo B531
Blending brush	10mm	18mm	Aluminum one-piece stamping	Sigma E40
Stippling blush brush	15mm	22mm	Copper ferrule+ metal rivet fixing	Chikuhodo Z-4
Flat foundation brush	22mm	28mm	Aluminum ferrule welding + antibacterial coating	Morphe M439

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►Golden rules for purchasing

Eyeshadow brush: inner diameter 8-12mm + 15-20mm length to balance powder collection and blending.
Powder brush: inner diameter ≥25mm + ≥30mm length to ensure fluffiness.

Pitfalls：
Unbalanced ratio of inner diameter to length (e.g., a 20mm inner diameter with a 15mm short ferrule, easily lead to bristle loose).
The welding burrs can easily scratch skin (check the smoothness when purchasing).

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Summary:

The ferrule size is the "invisible skeleton" of the brush function. Only by matching the parameters as needed can you unlock professional-level makeup effects!