1. A comprehensive tool of music : named music and our round farm wheel. Our 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. 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 musical possibilities. 3. Visualize the progress and scale of chords: The front of our 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 chord progress in different modes, so that you can easily switch music styles. 4. Personnel counting on the back: flip the music education tool to find the complete personnel counting guide. Quickly locate the positions of the 12 notes on the five-pointed star, improve your first reading skills and improve your overall music knowledge. Our tools can help you build a solid foundation in music and symbols. Colour:Black Material:Wood Size:. 12.5 x 12 x 0.8 cm Package Contents: 1 x Guitar Chord Wheel 1 x bag 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.