Feature:1. [Chord Progression] The A side is a chord series diagram of music theory, which visually displays the corresponding chord series of all modes, making it easy to learn and master the chords of all modes. After learning, it is easy to change the chords of various modes.2. [Staff Learning] The B side of this chord wheel is the common sense of the staff, the positions of all 12 notes on the staff are clear and intuitive.3. [Versatile Usage] The circle of fifths wheel unveils the secrets of chords and scales. Whether you play piano, guitar, violin, or bass, this versatile tool allows you to apply music theory concepts to any instrument.4. [Aluminum Alloy Construction] Crafted from aluminum alloy, this melody tool is both sturdy and lightweight. The surface is sandblasted for an elegant matte finish, and the text is engraved, ensuring durability and aesthetic appeal.5. [Stable Rotation] The rotating wheel features a smoothly roller design, providing a comfortable and stable user experience without unnecessary movement or shaking.Specification:Item Type: Melody Chord ToolMaterial: Aluminum AlloyFeatures: Not easily broken or deformed, a good tool to enhance music theory knowledge.Package List:1 x Melody Chord Tool1 x Storage Bag1 x Chinese and English Instruction Manual