This Olive Wood Nail Brush has Stiff boar bristles which have been set in the base in clustered rows to help scrub at dried-up skin on the hands. There are also more boar bristles set into the top of the brush. These boar bristles protrude at an angle so as to help clean beneath the nails. Each one of these professional-grade nail brushes have been made in the European Union using responsible olive wood. Lower bristle area: 2 3/16" x 1" (5.5 x 2.5 cm). Bristle loft: 10 mm. Upper bristle area: 2 3/16" x 1/8" (5.5 x 0.3 cm). Bristle loft: 9 mm.