Tbest Violin Bow Straighten Collimator Straightening Guide Tool Adjuster Corrector for Beginner Training 1/2 4/4 & 1/8 1/4 (1/2 Violin)

High quality: The transparent part is made of plastic and is in use. The adjustable strap with fine workman is firm and strong, hard to break, portable, no harm to your instrument. Easy to install and remove: design is easy to install or remove. Practical for self-bow: A self-bow guide that helps you to bend and act properly on the wrist. WORKD WELL WITH VIOLIN: Two alternatives, one for 1/8 1/4 violins and the other for 1/2 4/4 violins. Great for beginners: Very desirable term for violin beginners and violins who play a major role in mastering the correct bow action and improving their playing s.