This mouthpiece is a little smaller in diameter than a Schilke 14A4a. It is the same diameter top to bottom as a Wedge 5FC and is similar in depth to a Jet-tone Al Hirt, Monnette B4LVS or Bach 3F. 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. Most players prefer a 25 throat on these plastic models. The backbore is an S.