This accessory is used to help keep the students bow straight and at the appropriate position on the strings. Its clever design doesn't prevent the strings from vibrating and gives full movement over all four strings. It is great for students who are just learning to use the bow or have trouble keeping their bow straight on the strings.
They come in two sizes for violin/small viola:
For 1/8 - 1/4 violins
For 1/2 - 4/4 violins or 12" to 14" violas.
Like shoulder rests, these bow guides fit more than one size violin. They will also fit a violin strung as a viola and the 1/2 to 4/4 Horace Bow Guide will fit 12" to 14" Violas.
They come in two sizes for cello:
1/4 - 1/2
3/4 - 4/4