What's the approximate equivalent of a size 4, 6, 8 quill in rounds?

The 4, 6, and 8 quill will approximately equal the 16, 18, and 20 rounds in the Princeton Neptune line. This will not necessarily be the case for other brands, or even other Princeton lines, because brush sizes are not standardized. The diameters are 10mm, 11mm and 13mm respectively, and the lengths of the tufts will be 37mm, 38mm, and 40mm.

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🎨 Elevate your art game with every stroke — don’t just paint, make a statement!

ERGONOMIC STYLISH - Satin-finish blue handle designed for comfort and standout studio style
DURABLE EASY TO CLEAN - Synthetic materials ensure longevity and hassle-free maintenance
ALL SKILL LEVELS WELCOME - Perfect for students, educators, and pros tackling mixed media projects
PRECISION MEETS VERSATILITY - Ideal 16mm round tip for detailed strokes and broad washes
PROFESSIONAL GRADE SYNTHETIC BRISTLES - Golden Taklon fibers deliver smooth, consistent paint flow

The Princeton 4750R-16 Pri Neptune Synthetic Round Brush features a 16mm Golden Taklon synthetic round tip, lightweight 9g design, and a satin-finish blue handle. Engineered for precision and versatility, it suits artists from students to professionals working across decorative, technique, and mixed media painting projects.

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