Soulo Straight Mute comes in two variations—an all-aluminum straight and a copper-bottom straight mute. This is the all-aluminum version. Soulo Mute uses the highest quality Aluminum and Copper in order to achieve the most brilliant straight mute sound that classical musicians need. The all aluminum straight has perhaps a slightly brighter sound than the copper-bottom. Soulo Straight Mute is extremely lightweight. In fact this is the lightest trumpet straight mute on the market. Soulo Straight Mute will never fall out of the bell!. It uses unique neoprene composite corks which “lock” the mute inside the bell. Perhaps most importantly Soulo Trumpet Straight mute improved on two very important issues associated with most mutes – pitch and playability. Its ground-breaking aerodynamic shape delivers a perfect pitch and a free-blowing experience. Soulo Mute’s patented shape allows the air to naturally flow in and outside of the mute undisturbed by a crimp or any other barrier. On the inside the air flows into a perfect hemisphere never hitting a flat surface thereby not altering the pitch. Because of its innovative qualities Soulo trumpet straight mute received a patent by the USPTO. Soulo Mute’s trumpet Straight Mute is endorsed by some of the biggest trumpet pros like Wayne Bergeron as well as symphonies and philharmonics around the world. Some of the philharmonics endorsing it are The San Diego Symphony Baltimore Symphony Orchestra Saint Luis Philharmonic Frankfurt Opera and Hongkong Philharmonic. Its success is largely due to the vast improvements on the typical straight mute issues while preserving the traditional trumpet straight mute sound.