Designed to allow smaller birds to feed first. Larger birds cannot easily land and generally wait for food to fall to the ground. Attract finches, waxeyes, sparrows etc. to your garden. The kit is partially pre-assembled and only requires you to fit 8 screws into pre-drilled holes. A great practical project for all ages that will provide hours of entertainment once its finished. The timber is treated and the roof is sheet metal. Leave it natural or paint it up - your choice. The finished size is 26.5cm x 22.5cm x 38 cm high. Everything you need comes in the box - minus the screwdriver of course. If you would rather we assembled it for you we are happy to do that no charge. Just request it when you purchase. Thanks