Tried and true, Doh Doh's bushings, let you customize your trucks to get the perfect turn and control. Harder bushings are good for heavier skaters, going big and preventing wheelbite. Softer bushings are good for tech skating, bowl skating and sharp turns. These bushings are also great for absorbing impact and snapping back to straighten you out after landing.
If you like tight trucks, these things are great after you break them in, but both my front and back barrel bushing split after 2 months of riding them and a week or two after that, the back one completely broke and I had to go back to my stock bushings