The Ironman 4x4 Suspension is available in differnet configurations, therefor allowing you to choose the optimal suspension for your needs.
The different shocks are suitable for differnt kinds of offroad driving: The entry level is the Nitro Gas shock providing an noticable improvement over the oem shocks and allow medium offroad driving while being the bang for the buck option. The Foam Cell Shock is the midrange off Ironman 4x4 shocks suitable for medium/heavy offroading while, thanks to the larger oil capacity than the nitro shock, staying cool. The Foam Cell Pro shock is the top of the line shock from Ironman 4x4 originaly developt for military use the shock is the perfect choice for heavy offroading.
The different available springs allow the suspension to account for additional weight added to your vehicle (for example by aftermarket bumpers, hardtops or else).