Bach, Cornet, Flugelhorn, Trumpet, Pearl Finger Buttons, 1 each, Bach part numbers nickel B3024, lacquer B3024LA, & silver B3024SP. Fits instruments such as the CR300, TR300, & FH200. These are not Stradivarius finger buttons, but will fit. Threads are 6-36 threads per inch (tpi). Contact us if you want to verify your model's fit.