Ultra-Pure Large Silver Polishing Cloth is a full 12x16 inches (30x40cm) and is large enough to polish all silver plated instruments - from Piccolo to Sousaphone! Just wipe the instrument with the silver polishing cloth and buff with our Extra-Large Microfibre polishing cloth. This microfibre cloth has been pre-treated with a fine silver polishing compound. Do not wash the cloth or the silver polish will wash out.