Features:

The simple way to practise straight bowing!
Master straight bowing.
Gain muscle memory.
Say goodbye to sawing sounds.
This is a new way to improve learning the violin. Designed by a violinist, for violinists, it is a neat device that simply clips on to the fingerboard and guides the bow at 90° to the strings – this means you have instant straight bowing! In time, this transfers into muscle memory and the learner can become an expert violinist in no time at all!
Being made of carbon fiber, light weight, it cannot strach or damage your violin at all. It is also small enough to easily fit in your violin case!
Self bowing practice guide and it help you cultivate correct bowing and wrist action.
Durable in use,easy to install and disassemble,attaches easily, and in seconds.difficult to break off, wearable, no harm to your instrument.
Teaching Tool and Training Accessory.
Easy to practice violin, no slide bow.
Upgrade the violin viola bow to assist in correcting the positioning tool.

Specifications:

Material: carbon fiber 
Color:black
Size:for 1/8 1/4 1/2 3/4 4/4 violin
Net weight:18g
Package weight:62.5g
SKU:VP0908-451

Package List:
1PC *Violin Bow Collimator