ATI PERFORMANCE SUPER DAMPER Harmonic Damper [OUTER DIAMETER 8.90 10% OD | SHELL MATERIAL ALUM | RIBS 10 & 6 | HUB MATERIAL STEEL] (2015-2020 Charger & Challenger SRT Hellcat) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS