Features: 4/4 violin bow corrector is easy to install and disassemble with the convenient fastener tape. Self bowing practice guide and help you cultivate correct bowing and wrist action. Made of strong steel and polished ABS, more stable and better protect your hands. The steel pin can rotate freely, lightweight and mini size for convenient carrying and storage. Great for beginners to master correct bowing action and violinists to improve their playing skill. Specifications: Color: Black Material: ABS + steel Item Size: 15.3 * 12.5 * 1.3cm / 6.02 * 4.91 * 0.51in Item Weight: 64.7g / 2.28oz Package Size: 12.7 * 16.3 * 2cm / 5 * 6.42 * 0.79in Package Weight: 85.8g / 3.03oz Package List: 1 * Violin Bow Corrector