Yes, upright basses come in various sizes. The standard size is 4/4 and is the most common size. However, there are also 3/4, 1/2 and 1/4 sizes that are designed for children or small adults who may find the full-sized version difficult to play. There are also 5/8, 7/8 and even 6/4 sizes available for those looking for a larger instrument. Double Bass strings are made for the specific length of the instrument.