Bore-Max Speed Brush Features The Bore-Max Speed Brush has twice the bristle density of standard brushes for maximum scrubbing power. Stiff nickel plated phosphorous bronze bristles eliminate chemical breakdown in the bore and extend the life of the brush. Bore-Max Speed Brush Specifications Brand: Real Avid Model: Bore-Max Series: Speed Brush Caliber: 35 Cal Bristle Type: Nickel Plated Bronze Gun Type: Rifle