Includes one of each Jang roller: Y-24, X-24, F-24, and XY-24 for seeding Asian greens, mustard, arugula, raw lettuce, and more. We recommend setting your seeder gears to seed at 0.5" apart for the ideal seeding density. For use with all JP Series seeders. Scroll to the base of the page for recommendations from our Jang Seeder Roller Trials.