 Cane is usually pulled until it reaches roughly the diameter of a pencil, when, depending on the size of the original lump, it may be anywhere from one to fifty feet in length.After cooling, it is broken into sections usually from four to six inches long, which can then be used in making more complex canes or in other glassblowing techniques.The simplest cane, called "vetro a fili " (glass with threads) is clear glass with one or more threads of colored (often white) glass running its length.