1. chord schedule, pentagonal circle and personal symbol guide provide comprehensive resources for understanding and mastering the of music . Explore the progress, scale and more of chords in a convenient tool. 2. aluminum alloy structure: Our guitars and chords are made of high-quality aluminum alloy and are . The is polished and oxidized to obtain an elegant appearance, while the laser-carved text ensures lasting visibility. 3. Convenient wheel design: Our round wheels are designed with rotating wheels to facilitate access to different scales and chord progress. Smooth and stable rotation can prevent unnecessary vibration and accuracy and ease of use. Browse different modes easily and discover new musical possibilities. 4. Visualize the progress and scale of chords: The front of our aluminum alloy chord wheel displays the progress and scale of chords, providing a visual representation of the corresponding chord degree for each key. Easily learn and master various chord progress in different modes, so that you can easily switch music styles. Color: Black Material: PC Package Contents: 1 x Guitar Circle of Fifths Wheel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.