Â Top-selling firm blend of nylon and polyester for balanced flex Â Recommended for use with medium-weight coatings indoors or out Â Provides good glide and excellent coverage for all-purpose painting Â Square rust-resistant steel ferrule Â Sealed maple wood handle High-production performance makes Ultra/Pro Firm the best-selling blend and a favorite for over 20 years. Featuring a mix of purple nylon and sable polyester, itÂs truly an all-purpose brush for use with medium-weight coatings such as acrylics or enamels, indoors or out. With outstanding paint capacity, excellent release, and masterful cut-in control, Ultra/Pro Firm saves painters time wherever a firm brush is needed. Just-right flex and taper provide even coverage with good glide. For the moderate touch, look for the purple and brown filament and the maroon stamp on the handle. Width: 3. Trim Length: 3-7/16. Thickness: 7/8.