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The sizes of brushes used for painting and decorating is given in mm or inches, referring to the width of the head.
Bristles may be natural or synthetic. If the filaments are synthetic, they could be made of polyester, nylon or a blend of nylon and polyester. Synthetic filaments last longer than natural bristles. Natural bristles are preferred for oil-based paints and varnishes, while synthetic brushes are better for water-based paints as the bristles do not expand when wetted.
Handles may be wood or plastic; ferrules are metal (usually nickel-plated steel).
| Size | Thickness(mm) | Visible Lengthout | Master Pack(doz) |
| 20mm | 10.5 | 1-3/4" | 72 |
| 25mm | 11.5 | 1-3/4" | 60 |
| 35mm | 12.6 | 2" | 48 |
| 50mm | 13.6 | 2" | 36 |
| 60mm | 14.6 | 2" | 30 |
| 75mm | 15.7 | 2-1/4" | 24 |
| 100mm | 17.5 | 2-1/4" | 12 |
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