This is the incredible Airtronics 94758 Digital High Speed Metal Gear servo for R/C car applications. This is one of the fastest digital servos you can buy, and is one of the best available, especially for 1/8th scale buggies. This servo has the following specs:

Torque: 92 oz/in @ 4.8V, 115oz/in @ 6.0V
Transit Time: 0.07 sec/60 degrees @ 4.8V, 0.06 sec/60 degrees @ 6.0V
Weight: 2.12 oz
Dimensions: 1.54" x 0.79" x 1.47" (39 x 20 x 37mm)