Hair: synthetic has largely won
Synthetic filament — taklon, PBT and nylon — now covers the majority of private-label orders, for animal-welfare, cost and consistency reasons. It also handles cream and liquid formulas better than natural hair, which absorbs them. Natural hair (goat, squirrel, weasel, horse) still appears in high-end powder and blending brushes, and carries CITES and animal-welfare documentation questions you should raise early rather than at the port.
Ask for filament diameter in numbers: 0.07 mm reads as a soft powder brush, 0.10 mm as a firmer foundation brush. Shape names are marketing; diameter and taper are the specification.
Handle and ferrule
- Handles — birch and beech are the workhorses; bamboo is lighter and more prone to splitting at the ferrule; ABS plastic and aluminium suit slim, modern formats. Lacquer and water-transfer finishes scratch, so specify the finish test if the brush will travel in a pouch.
- Ferrules — aluminium is standard, copper and brass read as premium. The crimp is the weak point: a loose ferrule is the single most common complaint in brush reviews.
- Assembly — two-part epoxy is the norm. Cheap adhesive stays tacky and smells for weeks after packing.
MOQ, sampling and tooling
Brush MOQs are friendlier than packaging: 500–1,000 pieces per SKU with your logo is common, because printing and handle finishing are the only custom steps. A brush set of six to twelve pieces is usually quoted per set. Hand samples take 7–15 days; a custom handle mould adds 20–30 days and USD 800–3,000 depending on shape. Silk-screen or hot-stamp logos on the handle are inexpensive; laser engraving costs more but does not wear off.
QC checks that catch real failures
Pull-test every ferrule in the sample by hand — it should not rotate or lift. Wash one brush, dry it, then brush it across dark paper to check for shedding and dye bleed. Smell the handle where it meets the ferrule for solvent residue. Finally, weigh a set: consistent weight across units is a reliable proxy for whether the factory controls its own assembly line or is subcontracting it.