Black Poly Foam Brushes JEN Deluxe brushes are made in the USA out of patented hi-density black poly-foam. The foam comes to a fine chisled edge and each brush has an internal plastic stiffener for support. You can see the difference when you look at JEN poly-foam brushes alongside the imported brushes sold in the big box stores. These are the original Poly-Brush, the choice of professional woodworkers and shipwrights for years. These brushes have a higher density than most which makes them last longer for the bigger jobs. Ideal for varnishing, painting or staining. Any application where brushstroke marks or hairs left in the finish will be a problem. Not for use with shellacs or lacquers.