Towers are formed when natural crystals are taken and then cut & polished, they come in many sizes in almost every stone known. they give a large size for a cheaper amount than other styles such as spheres. 
please note that due to the nature of these products you will be sent a tower the same size as you select unless it is stated that it is that specific crystal, Due to the shape and style of these products it is possible that there may be some small imperfections such as small chips on the crystal, the most common place to find these is the tip and the base, particularly on the softer stones, if this is a major issue please contact us for photos of your items.