Single refill cartridge for the ultimate eye styling tool. Color twists up, never needs sharpening. Refill easily snaps into place. You can create custom color tools using the Automatic Eye Pencil Duo, thanks to the unique snap-in, snap-out cartridges. For example, if you have an Automatic Eye Pencil Duo in one shade, try a refill in a second shade. Snap out the smudger cartridge and snap in the second shade for an ultra-convenient and very versatile tool. All Estée Lauder eye liners are fragrance-free and ophthalmologist tested.