Of good quality; superior in quality. Used prenominally to describe a noun ("good-quality ~").
質の良い布を使った服は着心地が違う。
Clothes made from good-quality fabric feel different to wear.
質の良い家具を選べば、長く使える。
If you choose good-quality furniture, you can use it for a long time.
質の良いサービスを提供することが会社の信頼につながる。
Providing high-quality service leads to trust in the company.