Features: Firm and strong construction, and it is not easy to break off. Easy to install and disassemble with the convenient fastener tape. Mini size and lightweight resin material for you easily put it into your gigs bag. Self bowing practice guide, it could help you cultivate correct bowing and wrist action. Great for starter to absorb correct bowing action, and violinists to improve their playing skill. Specifications: Material: Resin Color: Black Package Weight: approx.55g Size: approx.11.3x5.1x8.5cm/4.44x2.00x3.34in (More Size Detail, Please See Photo.) Note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks! Package includes: 1Pc Violin Bow Straightening Corrector