Soldering involves using an alloy of 60% tin and 40% lead. A classic soldering iron is 30W and has a permanent heating element that remains connected to electricity during use and idle time. To solder a component to a copper plate, the tip and plate are heated and then tin is applied to allow the component to bond for a few seconds as it cools. Soldering supports can be made of sponges or sheets of metal and wood. Soldering iron tips include fine tips for electronics and desoldering attachments with bulbs to remove solder.