A Quality (クオリティー Kuoritī) in an indicator used primarily with Composition Monsters, like Ranks are with Xyz Monsters, and Wavelengths are with Spectrum Monsters, though some Hybrid Monsters (those that specifically state a Composition Monster as their Material). Like other indicators, Qualities are rough indicators of the monster's strength.
Quality Stars have a different arrangement habit than other indicators: Rather than start from one end of the card and move to the other end, Qualities start in the center of the card and expand outwards as the Quality gets higher. Only Wavelengths share this habit.
The Quality of a Composition Monster is the same as the Level of the Base monster required to Summon it. As such, a Composition Monster can be of any Quality.
- Quality Stars are simply color-inverted Rank Stars.
- The white and blue color of Quality Stars, in combination with Composition Monster's red color and the use of stars, is a subtle yet unintended reference to the flag of the United States of America. The inventor of Qualities, Taylor Gorrell, is an American.