DS1313 Metal-Geared, Coreless, Ball Bearing, Hi-Torque Digital Servo from Thunder Tiger (distributed by Ace R/C in the USA). This servo replaces the previous model DS1211 (ACE8123) servo. This servo was designed specifically for high performance R/C cars and monster trucks and has a universal connector which will fit Airtronics, JR, Hitec and Futaba receivers (be careful with the polarity of the connector for Futaba radios). It also includes a large heatsink servo case so it can deliver the amounts of torque without breaking a sweat! This is a very fast and powerful servo, and makes a good steering or throttle servo for buggies and trucks! Note: This servo will draw less current from your receiver pack than the ACE8127 servo, so would be a better choice for a throttle servo or even the steering servo if you wish to have less current draw. The specs on this servo are: Transit time: 0.13 sec/deg @ 6V Torque: 12.5 kg/cm (173.6 oz/in) @ 6V Weight: 66g (2.328 oz) Length: 41.8mm Width: 20.6mm Height: 39.6mm