This product is used worldwide! It make it unbelievably easier to learn to play guitar. Seeing the notes that make up the chords as you are playing a chord progression is a great way to know what notes will sound good with that chord progression. Specifications: Material: paper  Package size: 200 * 100 * 10mm / 7.87 * 3.94 * 0.39in Package weight: 10g / 0.35ounces Note: Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Package List: 1 * Fretboard Note Set