Sold as two bushings, flat washers, and a sticker.
APS stands for Animated Polymer System. This urethane is very lively giving you more turn that a same durometer stock bushing, with lots of rebound. APS doesn’t compress the same as stock bushings and other formulations, so you can take it from the standard just snug washers to a few full turns without effecting the compression and decompression characteristics.
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.