The benefit of the barrel over the more commmon double cone setup is the barrel provides a bit more resistance than a cone of the same durometer, and helps the truck return to centre easier. This means your trucks are less likely to flop over or stick to one side – and Tracker provide two replacement cup washers in each pack to make sure these bushings get exactly the support they need to maximise that effect.
Note that Tracker’s bushings come in single-truck packs, which means you’ll need two packs to upgrade both trucks.
These are the 88a Superballs, making them the same (or similar) hardness to what you get in most trucks. As such, they’re a perfect replacement for any worn-out (or just outright terrible) stock bushings – grab two packs of these and make your old trucks feel like new again.