The Jazz has the same rim as the Lead but is about the same depth as a Wedge 5DC, Bach 3D, Monette B4L or Schilke 14A4a. This is a very versatile mouthpiece for jazz or pit. It has surprisingly good lower register for a mouthpiece with such excellent upper register performance. This mouthpiece has our new Double Oval Cup (DOC). The diameter of the rim and cup in the vertical dimension is 10/1000 of an inch larger than it is from side to side. This means that the oval shape of the Wedge rim is continued down to the base of the cup where it joins the throat. The DOC design, found only in Wedge mouthpieces, provides the added efficiency of a smaller mouthpiece with the big sound, clear attacks, and flexibility of the larger mouthpiece. Wedge plastic mouthpieces are machined from black Delrin just like our brass and stainless steel models. They have all the advantages of a metal Wedge mouthpiece, the main difference being that they play with a darker sound. Slotting and response is excellent. This top can be played with any Wedge or Warburton backbore with a matching throat. The metal backbore brightens the sound slightly compared to all plastic models.