Andoer Clip-on 6.5mm Sound Pickup for Guitar Bass Cello Ukulele Violin with 3.5mm Male to 6.5mm Female Jack 3.5mm Female to 3.5mm Female Adapter The mute can help affect the timbre, reduces volume, allowing you to practice violin without disturbing people. The rosin is suitable for violin, viola, or cello bow, increasing friction. The fine tuner is made of high quality cupronickel, sturdy and durable. The pitch pipe can help you to learn the correct pitch sound so that you eventually can tune your instrument. The polish cloth with soft surface, remove fingerprint, dirt, dust or grease mark as a breeze without scratch or lint.