Chinatera Professional Acrylic Alto Saxophone Mouthpiece for Sax Playing The Jazz Music Transparent Good performance and durability,no chips or bite marks For: Alto Saxophone Material: Acrylic, Color: Transparent Length: 90.85mm/3.58" , Size of open tip: about 40mm/1.57", the diameter of the hole: 18mm/0.708" Package Includes: 1x Alto Saxophone Mouthpiece