The Jang JP-1 Seeder singulates and spaces small to medium size seeds accurately, saving seeds, time and labor. The quick change seed rollers (sold separately here) are available for many sizes of seeds and seed spacing. View Jang JP Roller Chart by Crop. Spacing is adjustable using 6 different sprockets that are included with the seeder. The unit comes with a 1 quart clear hopper which allows you to see how much seed is remaining, and is easily removable to empty out unused seed. Seeding depth is adjusted with a single screw adjustment. Optional fertilizer hopper and are also available.