Cavallaro Trumpet Mouthpiece Roll The Cavallaro mouthpiece roll is designed to hold 4 mouthpieces It is made of a nylon shell with a lamb's wool interior to protect your mouthpieces Two strap loops are added to the back of the roll for your option to attach the mouthpiece roll to the shoulder strap of your gig bag if you so desire Two strap loops are added to the back of the roll for your option to attach the mouthpiece roll to the shoulder strap of your gig bag if you so desire