They concentrate the mass for less overall rotational mass than the the stock Jato driveshafts

VVC/HD SHOCK SET

Traxxas Exhaust Header Blue

Keep your ARRMA 6S drivetrain spinning with the genuine ARA311052 12T Mod1 Safe-D5 Pinion Gear

Losi - LOS-1986 Aluminum Servo Mount: Micro-B big-rock-3s-parts They concentrate the mass forLosi LOS 1986 Aluminum Servo Mount: Micro B The Losi LOS 1986 is an aluminum servo mount made for the Micro B. This mount secures the servo to the chassis, and aluminum construction adds durability over the stock plastic part. Upgrade your Micro B's servo mounting with this durable aluminum part. Genuine Losi part, number LOS 1986 Aluminum servo mount Compatible with Micro B