Upgraded springs, stiffer than the stock springs. They also have rubber dust covers to help protect it from dust & dirt.
View our video showing the difference these make to your shocks here:https://s1.itseeze.com/sites/toptubz/videos/#shock-upgrades
They are easy to install. 1/10th scale shocks come in the sizes 70mm and 80mm which you will get 2 of each in a set.