These Loop-end string protector fits on the adjuster’s claws to prevent the claw cutting and snapping the string (pack of 8).
Loop-end strings, while thought to offer the best response and sound, are notorious for breaking at the loop. This is usually due to the metal-on-metal contact between the string loop and the fine tuner. Loop-end Protectors are a naturally lubricated plastic cover for your single-prong fine tuner, which prevents breakage, but doesn’t reduce sound quality.
8 Loop-end string protectors are included in each pack.
Joseph Gold, Concert Violinist and Music Critic
The WITTNER "E string protector" is a neat little devise. Its express purpose is to prevent breakage at the loop end of a violin "E" string when using an English style tuner. This it does very well. The protector is a small plastic part that fits easily into the tuner. A violin maker friend keeps the protector in place with a small drop of "Super glue". Be careful when doing this!
I wondered if the protector would have any affect on the tone of a violin. To prove my theory, I made a scientific experiment. In short, the protector will prevent breakage at the loop end of the E string. It does have a small affect on the tone of the violin. It reduces, by very little, the high overtones of a violin. This is an advantage when the violin in question has a soprano (i.e. shrill) tone.
Use the protector if
1) you experience the E string breaking at the tuner, and
2) if your violin has a shrill tone and you want to reduce the high overtones.