Our HW Brass-Saver® set for French horn is the easiest and safest* way to clean saliva and corrosive mineral deposits from the inside of your horn. The patented design features two non-metal flexible brushes that won't scratch or get stuck. One is sized for single or double lead pipe (approximately 1/2" diameter and 51" long), the other for the removable slides (approximately 3/4" diameter and 30" long). The special fiber will not shed, shrink, or swell, can be used wet or dry, and stands up to the chemicals in cleaning solutions. Protected by US Patent #6,868,575.