The excellent quality 4 and 7 inch tall ultra clear humidity domes now have built in light tracks that fit most fluorescent strip lights. Works great with the Super Sprouter T5 HO Grow Light #904292. Straight vertical sides allow use of all plant sites in a propagation tray. Two ultra clear vents in the top of the dome can be opened or closed to control humidity. Fits snugly on a standard 10in x 20in propagation tray. Replacement half circle vents are used to replace lost or broken vents on your Super Sprouter propagation domes.