Sold as two bushings, large flat washers, and a sticker
WFB or Worlds Fastest Bushing- is a special formulation of urethane where there is a lubricant mixed in to the urethane. Which is why these bushings will sometime look a little crusty.
The result is an even deeper turn than the APS allows. So if you are looking for a bushing that is supportive but still allows full controlled deep turns, then throw some of that WFB into the mix.
Chubby Bushings are like a full girthed barrel. It's wider, so expect this bushing to increase your break from center feel, as well as bump up your set ups return to center. If you go extra soft, then you can compress them down for this really squishy but supportive feel.