The Kuru Toga has an automated system that spins the lead every time the pen is lifted from the paper. This allows the lead to wear down evenly and in a conical shape.
The Advance Upgrade includes an upgraded mechanism that rotates the lead twice as fast as the regular/standard Kuru Toga (once every 20 strokes vs. every 40 strokes.).
The Advance Upgrade also features a protective sleeve for the pipe that protects the lead as you write as well as a heavier body with machined bottom grib.
The sleeve can be fully retracted when the pencil is not being used, protecting it from getting bent or poking a hole in your pocket or pencil case.