This is the Associated XP Digital DS1313 Servo with Coreless Motor.
FEATURES: Metal gears
Coreless motor offers smooth operation and fster response time
Aluminum heat sink dissipates heat build-up for fade free performance
Water and dust resistant
INCLUDES: Associated XP Digital DS1313 Servo with JR type connector,
1.7" (44mm) long double servo arm
REQUIRES: Installing in vehicle and connecting to receiver
SPECS: Dimensions: 1.6 x 0.81 x 1.5" (41.8 x 20.6 x 39.6mm)
Weight: 2.32oz (66g)
Torque: 173.6 oz-in (12.5 kg-cm) @6V
Transit Time: 0.13 sec/60°
COMMENTS: For Accessory Pack, order ASCC9212
For best performance use only an FM radio system and high capacity
6V NiCd or NiMH batteries.
A note on Coreless motors: conventional servo motors have a steel
core armature wrapped with wire that spins inside the magnets. In
a Coreless design, the armature uses a thin wire mesh that forms a
cup that spins around the outside of the magnet eliminating the
heavy steel core. This design results in smoother operation and
faster response time.