10 inch by 20 inch clear plastic humidity domes. Durable and reusable. Designed to fit perfectly with the 10" x 20" growing trays we offer. These 20" X 10" clear plastic domes fit perfectly with the black 10"x20" trays we offer (both with and without drain holes). These domes may not be a perfect fit with similar trays sourced elsewhere. Base of Dome - Exact Dimensions: Length: 20.5 In. (522 mm) - Width: 10 1/8th In. (255 mm) - 2 Inches tall