Features: The Music Theory Wheel is crafted from premium acrylic with an oxidized sandblasted finish and engraved text, ensuring durability and portability for seamless music learning, making it essential chord progression chart tool. Featuring a smooth rolling wheel design for stable, comfortable operations and double sided functionality—Side A displays intuitive chord progression charts for all keys, while Side B detail staff notation with all 12 notes, providing clear visual aid as a top music learning tool. Ideal for music students, educators, and hobbyists seeking to mastering chord changes and staff reading efficiently, this device caters to learners at all levels in their musical journey. Perfect for practice, classroom instruction, or on the go use, allows for easy transport and quick reference during rehearsals or own study. Enhances your music theory skills with this comprehensive wheel, which simplifies complex concepts through its user friendly design and comes with a detailed manual for immediate application. Specifications: Color: Black Component: Acrylic Diameter: Approx. 4.72inch(12cm) Package Includes: 1x Music Theory Board note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.