Grand Prix® Filbert shape• Use® filbert brushes for botanical shapes, details of the human form, and portraiture. Curves, ovals, shaped figure work. Grand Prix® Long Filbert shape easy reach to canvas, ease of control without stress; for portraiture, still life, figurative, shape, detail. Long filberts are 20% longer length out than traditional filberts. Grand Prix® Fine artist brushes feature multi-diameter bristle filaments that carry heavy bodied acrylic paints effortlessly across your painting surface. Grand Prix® series is stiff, durable and snappy with fine points for crisp, clean strokes. Grand Prix® series are rugged enough to withstand rough treatment on textured surfaces. Paint Type: Oils, Acrylic, Jar and Heavy Bodied Acrylics, Oils, Gouache, Casein, Varnish. Grand Prix® series brushes are handmade by expert artisans who undergo extensive training before they are skilled enough to produce the kind of quality that has become synonymous with Silver Brush Limited.