Here is what Innova has to say about the Pig:
 
The Pig is an overstable Putt and Approach disc. It is great for hyzer putting, sidearm approaches and backhand spikes. The Pig holds the line well, even in extreme wind conditions. The Pig features a Thumtrac® Rim for sure grips on sidearm throws and putts. It performs equally well for backhand or sidearm throws.