Product name:Guitar Chord WheelProduct size about : 12.4cm/ 4.8inProduct color: As shown in the figureProduct material:Aluminum Alloyproduct features:1. Guitar chord system: The chord wheel adopts the guitar number system in music theory, which can identify each chord in the key by numbers, and applies the chord number system to the fretboard. Easily master chord music theory.2. Guitar auxiliary chord tool: This melody tool contains 72 most commonly used chord diagrams in 12 keys. Turn the round disc and you can clearly see the chord fingering diagram in each key and its corresponding scale degree (from I to VII).3. Chord fingering assistant: There are 36 seventh chord fingerings on the back of the music transposition tool wheel, which are major, minor, and dominant seventh chords, making the chords colorful. The front contains major triads, minor triads, and half-diminished sevenths.4. Practical: After practicing fingering and chord theory for a long time, you will be able to discover patterns and change keys easily.5. Perfect gift: This 4.8-inch wheel is made of aluminum alloy, portable. It is a great gift for music lovers, students, and teachers. Help them understand guitar chord theory and improve learning efficiency.Precautions:1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images.2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only.Shipment includes:1 pc Guitar Chord Wheel