yield lab 10 x 20 inch black plastic propagation tray (10 pack) – hydroponic, aeroponic, horticulture growing equipment yield lab yield lab 10 x 20.75 inch propagation trays are lightweight, easy to use, and designed for clones, cuttings, and seedlings. allow your plants to achieve a strong root structure within these handy reusable containers, which are durable enough to serve many years of your horticulture needs.