RPM A-arms are the toughest A-arms on the market so a rough landing or a hit from another competitor won't take you out of the race

leather and most plastics

At the other end is a 10mm box wrench for fast removal of flywheel nuts on most nitro engines

13 sec @ 6

Water-resistant

Hot Racing - Super Heavy Duty Steel Differential Lock for SCX II with AR44 Axles Replacement Parts Car and Truck Engine and Servo Mounts RPM A-arms are the toughestHot Racing optional super heavy duty solid billet steel front or rear differential (diff) locker (spool) for the 1 10th scale Axial SCX II with AR44 axles. Included: One (1) locker spool (gear not included) Four (4) M2x6mm ring gear mounting screwsFeatures: CNC machined solid billet steel Compatible with the front or rear differentials Replaces stock cast locker diff case for extreme durability Black oxide finished for corrosion protection