Our newly released window vents are designed to fit perfect in your 2013-2017 Focus ST/RS. They feature a 3 layer construction to allow for proper installation. The window fits between the inside and outside layer, while the middle layer inserts into the door frame. To install, simply lower the window, set into place, and raise back up. Once installed, the window vents are secured into place. Lower the window to remove. Use them at the track, driving around town, or to add that extra style to your show car! Made from a high quality PMMA plastic. Sold as a pair. Ships within about a week.