The Marzocchi Dirt Jumper forks are all made for super heavy duty with extra strong stanchions, steerer tube and lower legs to survive the biggest landings. They are in 3 models: 1,2 and 3 with 1 being the top one.
Dirt Jumper 1 has: Coil Spring for plushest performance and ride feel, Travel: 100mm, Preload Adjustment, Rebound Dial, Stanchion: 32mm Alloy, high quality precision internal cartridge damping system, Air Pre-load.
Dirt Jumper 2 and 3 have similar specifications except for using steel instead of alloy and are therefore heavier, with 3 at an entry level price.