This Top Feeder complete kit you get and assembled wooden rim, set of corner caps and a center chimney cap.
Top feeders are great for feeding raw or dry white sugar in the early and mid-winter. Feeding in this way, don't use a "chimney cap" and let the bees range across the feeder. Raw sugar is considered better, as it has a bit of moisture in it already and the bees can work it and take it up. If using dry white sugar you may want to add a small damp sponge to the top feeder to give the bees some moisture to work the sugar.
In the late winter/early spring you may want to feed a heavy syrup (2 kg of white sugar to 1 Litre of water, heated until fully dissolved). This shouldn't stimulate the queen to lay and with it being in a top feeder she shouldn't sense too much the sugar coming in. When feeding in this way, use a chimney cap to restrict the bees and prevent them from getting out in the bulk of the liquid.