Manufacturer’s description:
‘Made of high quality spun aluminum, and tested to perform evenly in all registers, the Jo-Ral tenor trombone cup mute allows the sound to bounce back towards the instrument bell producing a smooth, rich sound and a dark, full-bodied tone. The mute features neoprene-enhanced composite cork pads that provide extra durability. The result is a more pliable cork that grips well and doesn’t dry out, become brittle or break off, so it lasts longer while easily accommodating fine adjustments for a perfect fit.’
Cup mutes are similar to straight mutes (cone-shaped with three corks) with an added 'cup' facing the bell of the instrument. Some are adjustable, allowing the distance between the cup and the bell to be modified. They produce a more subdued tone than straight mutes, reducing both lower and higher frequencies, and offer colours much favoured by jazz musicians.
Also available:
TRB-6S small cup mute