Alu radio plate mounts allow more solid radio plate mounting while reducing the possibility stripped threads. Newly-updated alu appears allow tiny throttle servo to be mounted in radio plate, and center gear become more precisely tensioned. Kept alu remain allows tighter belt stress adjustment. Ultra-strong construction for very long lifespan and durability in even the many extreme race conditions. CNC-machined from premium Swiss 7075 T6 aluminum. Number of 2 pieces (left & right).