Promotional mugs are indeed for marketing purposes but the function of them remains the same, they are not given out to sit on the side they are given out to be use, in fact the reason why the mug is one of the most popular chooses to personalise and make into a promotional item is because they are something that will be used and not disregarded. It is essentially a ceramic cup but often deeper than your standard cup as they are designed primarily to hold coffee and other hot beverages.
Depending n the type of mug the design of the handle may differ to fit it with the overall design. Mugs will always hold more liquid than your standard coffee cup, this is just the way are they designed and that will not change. They can be made from a number of different materials including; Steel, Bone China, Plastic, Stoneware and Strengthened Glass.
You will notice that mugs are rarely plain in design; they often have colours our intricate designs on them that catch you eye. In fact it is normally the design of the mug that determines which one you choose to purchase. There are a number of ways in which you can print upon their surfaces with screen printing being the most common, decals can also be added. When being used for promotional purposes the printing is the most important part, this is where the mug gets branded with your company logo and any text. These are very powerful advertising tools and extremely cost effective.