The J-4 seed roller has four half moom shaped cups, for items like cucmber, watermeloms and zinnia seed. Spacing is adjustable from 6-14” apart depending on seeder sprocket combination. Seeder rollers have cups/holes to cup the seeds to allow for singulation. Made from anti-abrasion plastic to prevent build-up of static electricity that causes seeds to stick together. This item is shipped directly from our supplier, please allow 7-10 business days for delivery.