Sold as two bushings 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.
Canon bushings were thought designed around the Paris Truck Company's signature hanger, but also fits on hangers with wider bushing seats like the new Caliber III trucks, or even Bear Gen 6.
The Canon is just a smidgen wider than a standard barrel so it's Return to Center is a little higher and break from center is a little more than a barrel. A perfect bushing for when you need to take out just a little turn for wheel clearance, but otherwise like how your double barrel busing feels.