Big Bore Go Purchase this set of big bore shocks, add oil and off you go Includes two different types of mounting pillow ball studs for different types of cars Included are different springs for you to fine tune your ride so you don't have to go looking for different springs after purchasing our set of shocks If you really want to get serious with tuning, there are different holes of pistons included so you can adjust the how the shock reacts to the shock oil. Include: Aluminum Big Bore Go Dampers (2 pcs) Soft Springs - Red (2 pcs) Medium Springs - Yellow (2 pcs) Hard Springs - Blue (2 pcs) Pillow Balls (4 pcs) Ballstuds (4 pcs) Threaded Ballstuds (4 pcs) Pistons (4 pcs)