DPA VC4099

Clip to connect a 4099 Instrument Microphone to a violin, viola, banjo or mandolin. The mounting mechanism makes it easy to move the mic between instruments with one hand.
The versatile gooseneck provides stable and repeatable positioning. The mics can be easily unclipped and repositioned or moved to another instrument. The mounting system is designed to never blemish or scratch the finish of your instrument. The flexible design supports a wide variety of mounting and positioning possibilities.

https://www.dpamicrophones.com/mic-university/how-to-mic-a-violin