Captain O-Ring LLC Dye DM4 / DM5 / DMC / DM6 / DM7 - Color Coded 5x Box Oring Rebuild Kit O-rings are color coded by size, eliminating the headache of matching up sizes. O-Rings separated by size/color in compartments. All of the o-rings you need to perform a standard rebuild of your marker five times (other quantities available).