This is a phosphor bronze bottom cap, which has become popular recently.
 For Bach trumpets.
 It's brand new.
 It has slightly more resistance than brass, allowing you to press the accelerator harder.
 It adds warmth and makes it easier to produce a three-dimensional, dignified sound.
 It also goes great with cornet and flugelhorn.
 It seems like it would be effective for orchestral, chamber music, and jazz solos.
 It's cute because it has a stylish color similar to pink gold.
 This product does not have a lacquer or other surface treatment, so it will oxidize naturally.
 These are new custom parts that are only available at UPMAKE. Please give them a try. There are 3 pieces in a set.
 Fits current 180ML and 190ML models. Please note that it may not fit special models.