1、Two alternatives, one is applicable to 1/8 ‑ 1/4 violins and the other one is used for 1/2 ‑ 4/4 violins. 2、ansparent part is made of tough plastic, durable in use. 3、The adjustable sap with fine workmanship is firm and song, difficult to break off, wearable, no harm to your insument. 4、The hook and loop closure design is easy to mount on or take it down. 5、Self bowing practice guide and it help you cultivate correct bowing and wrist action. Features: Two alternatives, one is applicable to 1/8 - 1/4 violins and the other one is used for1/2 - 4/4 violins. ansparent part is made of tough plastic, durable in use. The adjustable sap with fine workmanship is firm and song, difficult to break off,wearable, no harm to your insument. The hook and loop closure design is easy to mount on or take it down. Self bowing practice guide and it help you cultivate correct bowing and wrist action. Very desirable term for violin beginners and violinists, playing great role inmastering correct bowing action and improving their playing skills. Specification: Condition: Brand New Material: Plastic Color: ansparent + Black Application Option: 1/8 - 1/4 Violins Weight: Approx. 24g Packing List: 1 x Violin Bow Corrector