You'll love this reusable, no-mess seed-starting system. Just hydrate the 50 individual coir discs in their cells, add your seeds, and wait for the little shoots to appear! Water as needed until they're ready to transplant into the garden, coir and all! Replacement coir discs available separately 50-cell plastic tray 11" W x 21" L x 1.5" H 50 coir disc 1-3/8" dia. x 3/8" H Gardener's Supply Exclusive