Soundreturn For Trumpet Bell
It's a light-weight concave aluminum ring with three springs that grab onto the edge of the trumpet bell.
It's very fitting for playing in loud environments when it is hard to hear one-self.
These are better than sound reflectors because it provides a much superior natural return due to its concave shape while also being free to move around.
It's size allows being used with wireless microphones and all kinds of Mutes, even at the same time.