The 4" width is the broad-coverage brush for wide surfaces -- siding boards, deck planks, exterior trim, and large furniture pieces. The 2-pack is a project bundle for larger jobs -- one to work with, one to swap in for long sessions with oil paints or varnishes. 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 as a 2-pack
• Made by Jen Manufacturing, a Worcester, Massachusetts manufacturer since 1957

Best For: Deck staining, siding, exterior trim, fence boards, and long-session broad-coverage jobs where having a fresh backup brush keeps the finish consistent.