The GPM DSP12617 dampers are CNC-quality hop-up parts aimed at advanced hobbyists and tuners. Measuring 126mm in length and fitted with 1.7mm coil springs, the units feature a 17mm inner diameter and 20.8mm outer diameter to ensure accurate fitment. Included Delrin collars (14mm inner and 17mm outer) improve bearing of lateral loads and reduce component wear, making setup adjustments more repeatable across sessions.