(a) performance mutes: Tourte, Alpino, and classical ebony mutes; (b) light practice mutes, weighing less than 35 grams: light metal, black rubber, and red rubber mutes; (c) heavy practice mutes, weighing over 35 grams: heavy metal and rubber-coated heavy metal mutes; (d) altered mute and replicas, weighing over 35 grams: modified classic ebony, lead replica of the classic ebony, and lead replica of the rubber-coated heavy metal mutes.