The Marcinkiewicz flugelhorn mouthpieces are developed with close attention to detail and playablity. The cups have been designed to give you the type of sound you are seeking in an affordable package. All flugelhorn Models (except BSC FL) have a standard flugelhorn shank. Marcinkiewicz Mouthpieces Flugelhorn models The rim contours of our flugelhorn mouthpieces No.3FL(B/D), No.5FL(B/D) and No.7FL(B/D) are similar to our standard trumpet line. FLB designations indicates Bright and FLD indicates Dark. The No.3FLS, No.5FLS and No.7FLS are designed for a player that needs more lip (chops) room.Popular flugelhorn models The "300" series (No.303FL, No.305FL and No.307FL) is our largest flugelhorn mouthpieces series and has the same rim as the Student "300" Series trumpet mouthpieces, allowing the player to use the same rim on trumpet and flugelhorn.Numbering system Please keep in mind the No.3, No.5, and No.7 are logically numbered from largest to smallest in depth.