6" tall with humidity vents on top make this dome ideal for propagation. Fits a standard 10" x 20" growing tray. Please note, our automatic shipping software is not well calibrated for bulk purchases of this item. If you are looking to purchase more than 3, please contact us at orders@halifaxseed.ca. For the most streamlined process, please include a screenshot of the items in your cart, your mailing address, and phone number. We will contact you via phone to process payment.