Message to buy! This kit includes all the necessary O-rings to replace worn or damaged seals for one magazine This kit fits EMG / SAI RED 2011 / AW Custom RD0200 Series style magazines, Please look at the Images above and confirm your magazine matches the one in the photo. If we don't support your magazine yet, feel free to Contact us and request it! These O-rings come pre-lubed, and have a link to the YouTube tutorial in the packaging. In order to install this kit you will need: A valve key (Also sold on our page) A Phillips head screwdriver Pliers or a gripping tool Things that are nice to have: A pick to remove the O-rings Clippers to remove the small hammer valve O-ring (Blue)