Next, we have cup mutes and Harmon Style Mutes. These resemble a straight mute, but have a cup at the end that changes the sound. The Harmon, or Wah-Wah Style mute is a totally different sounding mute. I've also seen them called the Wow-Wow, and Jo-Ral calls theirs a Bubble Mute. The Harmon Brand mute is the one that started it all. In fact, regardless of the brand, they are usually called a Harmon Mute. The Harmon Brand is still a good mute, but most professional players play other brands.