The Best Brass Warm-Up Jr. mute is a light plastic practice mute for trumpet. This is a less expensive, molded-plastic version of the Best Brass Trumpet Warm-up Mute, and its low price means a significant savings. It's light, and plays very softly, one of the softest practice mutes we've found. It does give you less feedback and resonance, and some resistance, so the super low volume does come with some caveats. Still, it's so small that it stores inside the bell of your trumpet inside the case, making travel very convenient.