Brushes come in a variety of shapes and sizes, and brush sizes can differ between manufacturers. This article explains brush numbering systems that appear on the handle of paintbrushes.
Understanding Brush Sizing Systems - Jackson's Art Blog
Da Vinci Kolinsky Sable : Series 1203K : Ultra Fine Liner : Size 6
Painting with Jackson's Synthetic Brushes - Jackson's Art Blog
Painting with Jackson's Synthetic Brushes - Jackson's Art Blog
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Jackson Brushes - WetCanvas: Online Living for Artists
Understanding Brush Sizing Systems - Jackson's Art Blog
Product Review 43: Jackson's Art Supplies Studio and Icon watercolour brushes
Understanding Brush Sizing Systems - Jackson's Art Blog
VARIO TIP flat.Mixture of NOVA and TOP-ACRYL fibres in different lengths.So-called silver ferrule.Bordeaux lacquered esagonal handles.Made from a
Da Vinci : Vario Tip : Flat : No. 16