The inside diameter on the GIR MF1 is. 590, and the cup is shallow to extra shallow (similar to Bach E/F). The cup shape is a slight v-bowl. Not a straight V, but with very little roundness to it. The rim is medium round on both the inside and outside edges.The throat is an open #26, and the backbore is the Legends Manhattan, which produces a very focused sound. Use this mouthpiece when you're ready to "come blow your horn"! Outside Rim Diameter: 1.055 (26.797 mm). Outside Rim Contour: Medium Round. Inside Rim Contour: Medium Round. Cup Depth: Similar to Bach E/F (shallow to extra shallow). Backbore: Legends Manhattan (very focused). The item must be in new condition (no exceptions). THANK YOU FOR SHOPPING WITH US. Check out the other items in our store! This item is in the category "Musical Instruments & Gear\Brass\Trumpets". The seller is "legendsbrass" and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, Korea, South, Indonesia, Taiwan, South Africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi Arabia, Ukraine, United Arab Emirates, Qatar, Kuwait, Bahrain, Croatia, Republic of, Malaysia, Brazil, Chile, Colombia, Costa Rica, Dominican Republic, Panama, Trinidad and Tobago, Guatemala, El Salvador, Honduras, Jamaica, Antigua and Barbuda, Aruba, Belize, Dominica, Grenada, Saint Kitts-Nevis, Saint Lucia, Montserrat, Turks and Caicos Islands, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Ecuador, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Luxembourg, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Vietnam, Uruguay, Russian Federation.