The Paper Mate Option4 gives you quick access to 4 colorful ink options - black, blue, red or purple. Simply choose your favorite ink color and slide the mechanism that matches that color until it clicks into place to activate the refill color of your choice. (Slide the clip for black ink.) Depress the plunger or slide any other mechanism to easily switch to your next ink option. Great for quick color-coding, editing or just plain colorful writing!