The AMMO Dual Density Interior Brush features a unique blend of boar hair bristles cut to AMMO specifications for safe effective interior cleaning. Boar hair is functional at delivering cleaners like Lather or Shag, while efficiently wicking away dirt. The dual density function of the Interior Brush allows the user to control the strength of agitation via pressure with a softer outer ring and stiffer inner barrel. The outer bristles are excellent for gentle routine cleaning while simply pressing down will activate the stiff inner bristles for more embedded dirt. The interior brush is lightweight and features a contoured water proof handle durable for everyday use. Very excited to bring the innovation of dual density to an interior brush to create an essential detailing tool.