1/2 Machined Aluminum Servo Arm: Fut Blue, 25TOverview Dynamite's precisely Machined Aluminum Servo Arms offer maximum steering control, as well as instantaneous throttle and brake response by eliminating the flex often associated with nylon and plastic servo arms. These 1 2 arms are drilled and tapped for 3mm linkage hardware. Sold one per package and available in four colors, they are available in both JR Airtronics KO and Futaba versions.