Twice the bristle density of standard brushes for maximum scrubbing power. Stiff, nickel plated phosphor bronze bristles reduce chemical breakdown in the bore and extend the life of the brush. To achieve maximize effectiveness, there needs to be an optimal balance between bristle density and bristle flexibility. The bristle configuration of the Bore-Max Speed Brush provides maximum scrubbing density while retaining enough flexibility to effectively reach down into the lands and grooves. The elongated Speed Jag features multiple compression rings along the entire length of the jag. Bore-Max Speed Jag and Patches are precisely sized to provide the optimal compression and contact to wipe the Mfg: Real Avid