The Royal Victorian Greenhouse Optional Accessory Kit adds even more versatility to your hobby greenhouse, The Royal Victorian Greenhouse is one of the premier greenhouses in the line of greenhouses from Janssens of Belgium, The Royal Victorian Greenhouse not only provides a first class quality greenhouse environment, it also adds significant old fashion English style and beauty to your backyard, Kit includes one 4"" deep x 20"" wide planting shelf, one 4, 5"" wide top shelf, two inside shade cloths with pull rods and one extra automatic window opener, SKU: EXTR111