Super Sprouter Standard Humidity Dome 4 in (25/Cs) Excellent quality Super Sprouter® 2 and 4 inch tall standard domes with straight sides that allows the use of all plant sites in the propagation tray. Both domes fit snugly on standard 10 x 20 inch propagation tray. Use the 2 inch tall germination dome for starting your seeds. Then use the 4 inch tall humidity dome for medium sized plant starts and cuttings.... This item is sold individually. — Ships from H: WA, CA, CO, MI, TN, PA, FL USA....more info.