The 4" width is the broad-coverage brush for wide surfaces -- siding boards, deck planks, exterior trim, and large furniture pieces. Poly-Brush by Jen is a throw-away polyurethane foam brush that smoothes out the paint and covers correctly with fewer strokes, eliminating brush marks and loose bristles.

• Made from Jen's specially patented polyurethane foam
• Ideal for the application of enamel, latex, oil paints, stain and varnish
• Jen does not recommend using its products with shellac or lacquer
• Covers correctly with fewer strokes -- no brush marks, no loose bristles
• Wood handle
• Throw-away construction -- no cleanup required
• Width: 4"
• Sold individually
• Made by Jen Manufacturing, a Worcester, Massachusetts manufacturer since 1957

Best For: Deck staining, siding, exterior trim, fence boards, large furniture pieces, and any broad flat surface where 3" or narrower would take too long.