GPM XRT039S/P drive cup sleeves are manufactured from aerospace-grade aluminum to deliver consistent fitment and long service life for Traxxas XRT and X-Maxx models. They are intended to pair with the standard 17mm drive cups to reduce wear and maintain drivetrain alignment. During installation align the sleeve slot to the drive cup slot and, if any play is present from tolerance variations, secure the sleeve with an appropriate adhesive to ensure a reliable joint.