This is an AJW (Acid Jazz Works) trumpet mouthpiece. The size is reminiscent of a Bach No. 3 model. We believe this model would be of interest to those looking for such a mouthpiece or who prefer Bach No. 3 series. As this is a model that is not commonly seen nowadays, we recommend it to those who are interested. As this is a used item, there are minor scratches and scuffs from use, but it is still in usable condition. Please check the photos for the condition. It can be considered for performance as well as for collection. As we are not experts, we cannot guarantee the detailed specifications, playing feel, or compatibility. Please consider the expression "equivalent to Bach No. 3" as a guideline only. Please only purchase if you understand that this is a used item. Thank you for looking.