This is the Associated XP Digital High Torque High Speed DS1015 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 D1015 Servo with JR type connector, 1.7" (44mm) long double servo arm Mounting hardware 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: 201.4 oz-in (14.5 kg-cm) @6V Transit Time: 0.108 sec/60° Voltage Range: 4.8 - 6V Traveling Angle: 90°/180° OMMENTS: 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. jxs 12/10/07 ir/jxs