What It Is:The Satin Lipstick Refill is engineered as a unique fit within Byredo's iconic casing to be utilized and treasured indefinitely. Switch with ease among a range of subtle yet recognizable shades to match a range of emotions.How To Use It:- Pull to remove the refill from the base of your existing lipstick (sold separately).- Insert the new refill until you hear a satisfying click.- Remove the gold-tone cap on the refill before closing the lipstick casing.