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Stomvi have developed a range of bottom caps to modify and enhance the sound of their treble brass instruments:
- The Clapper and MaxiClapper incorporate a cone-shaped bell inside the cap which reinforces the natural harmonics of the instrument and smooths transitions between notes. 
- The Harmonic and Harmonic Light caps have a built-in soundbox or hollow void which functions as a resonance chamber, modifying the response of the instrument.
- The Dynamic caps have increased mass to improve stability and release the upper register.
Enhancements available in the Stomvi range:
| Bottom caps | Weight (g) | Qty per set | Description | 
|---|---|---|---|
| Clapper | 25 | 3 | Cone-shaped bell | 
| MaxiClapper | 55 | 1 | Cone-shaped bell | 
| Harmonic Light | 20 | 3 | Resonance chamber | 
| Harmonic | 25 | 3 | Resonance chamber | 
| Dynamic | 40 | 3 | Extra mass | 
Manufacturer’s website: stomvi.com
 
		
	 
		
	 
		
	 
		
	 
	 
	