they come with a weak spring but yu can order different springs, just visit their website and look at the exploded views of hte jsticks you can see the part numbers for hte jstick springs. the only bad thiing (for those not near a happs office) is hte 25$ minimum order, the springs cost like .18$ so you gotta buy a bunch opf other stuff to get your oder over 25$ i have just started goin and piocking mine up from them as it is only 15 miles from me.
springs do make a huge difference, i have used both eh weak and the strong, and i prefer the strong, just my opinion though