High quality; good in quality or craftsmanship. Commonly used in everyday speech.
このブランドは素材の質がいいことで有名だ。
This brand is known for the good quality of its materials.
質がいい家具は値段が高いが長持ちする。
High-quality furniture is expensive but lasts a long time.
彼女はいつも質がいい仕事をするので信頼できる。
She always does high-quality work, so she's reliable.