NEW STONELINED mouthpiece for trombone, made of cork and plastic, with a white and red design. - Model Name: NEW STONELINED - Material: Cork and Plastic - Colors: White and Red - Application: Practice mute for trombone Thank you for viewing. I am selling this because I haven't used it at all since I got an Okura mute, and it's just been a room decoration! Please refer to the photos for the condition. I remember buying it either on Amazon or at Wind Crew. Thank you.