eBoot Rubber 4/4 Violin Practice Mute, Black

I agree, I played in a professional orchestra and lived in a small apartment, and had the rubber practice mute that worked great. My neighbor was one of my co-workers, and said he couldn't hear me practice. I would go to rehearsal early to warm up and adjust my dynamics without it. Amazon.com: eBoot Rubber 4/4 Violin Practice Mute, Black : Musical Instruments