  The rapid development of DNA storage has brought the deletion and insertion
channel to the front line of research. When the number of deletions is equal to
the number of insertions, the Fixed Length Levenshtein (FLL) metric is the
right measure for the distance between two words of the same length. Similar to
any other metric, the size of a ball is one of the most fundamental parameters.
In this work, we consider the minimum, maximum, and average size of a ball with
radius one, in the FLL metric. The related minimum and the maximum size of a
maximal anticode with diameter one are also considered.
