<https://pioneerbrushusa.com/product/craftsman-swift-flat-interior/#product>
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"Flat brush head shape for trim painting.\r\n \tIdeal for edging and painting straight lines.\r\n \tSolid filaments for bend recovery.\r\n \tExcellent for use on rough surfaces.\r\n \tDouble locked brush assembly.\r\n \tStiffer formulation for thicker paints such as acrylic or latex paints.\r\n \tKiln stabilized hardwood brush handles made from sustainable birch.\r\n \tBrush heads steamed to shape to ensure a lifetime of precision painting.\r\n \tStainless steel ferrules.\r\n \tAvailable in sizes 1,1 ½”, 2”, 2 ½” 3” and 4”."
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