Check the listing for details. Proto PM6, PM7 - Color Coded 3x Oring Rebuild Kit. Condition: New. Listed at 14.59 USD. Proto PM6 / PM7 - Color Coded 3x Oring Rebuild Kit Product Features: O-rings are color coded by size, eliminating the headache of matching up sizes. Included color/size chart helps with your first time rebuilding your marker. After that, just replace orings by color when it comes time to rebuild again. All of the o-rings you need to perform a standard rebuild of your marker three times (other quantities available). Your marker can fire thousands of rounds every week, puts up with the beating of countless rainy Sundays, and withstands a number of slides through the dirt and mud. Through all of this, you still expect your marker to perform week in and week out. A small bit of maintenance is key to ensuring that your marker functions and performs at its best. One major aspect of marker maintenance is replacing your o-rings. The o-rings in your marker wear down over time by withstanding thousands of cycles along with coming in contact with dirt/debris. Our kits provide an easy and inexpensive way to keep your marker in top shape by swapping out your o-rings. Note: The product image associated with this item is a sample only. Your will receive the kit for your specific marker that you order which will contain the o-rings needed for that marker.