AR Resonance Trumpet Top WW_BS The plastic snap hook is

The plastic snap hook is quick and easy to clip on/off your instrument

Combining tradition with innovation

Offers a slightly darker sound profile

all while catering to the orchestral performer

A hard partition made of foam separates the slide from the main body of the trombone

AR Resonance Trumpet Top WW_BS The plastic snap hook isWeight: L (light = standard) Bore: 4. 0 mm (40) Made of nickel silver Silver plated RIM DIAMETERS Here's a rough comparison with Bach rim diameters L = Bach 1 1 4 17. 20mm ML = Bach 1 1 2 17. 00mm M = Bach 3 16. 80mm MS = Bach 5 7 16. 60mm S = Bach 10 1 2 16. 40mm CUP DEPTHS B = Deep, for experienced classical players C = Medium, good for all styles D = Medium Shallow, for more support on the high notes with still a big sound E = Shallow, not a lead