French Horn Mouthpiece Cleaning Brush - Mouthpiece Cleaner for Better Tone Production & Rotor Oil Pack Package includes Brass Mouthpiece Cleaning Brush & Rotor Oil. Brass Mouthpiece Cleaning Brush - This powerful cleaning tool helps remove dirt & grime build-up inside your mouthpiece, which is unsightly and detrimental. The tapered shape of this stiff bristled nylon mouthpiece cleaning brush enables thorough cleaning, and will help you maintain an unobstructed airflow making for better tone production. This tool is an essential accessory for all Brass Players. ROTOR OIL: RS Berkeley Rotor Oil provides smooth, quick action and will help prevent against corrosion and wear. This long lasting oil is perfect for brass instrument rotors.