This is a signed ball that I received a few years ago while watching a tennis match. I got autographs from Kei Nishikori himself and from a foreign player who was competing. As you can see from the comparison, the signed ball is about the size of a volleyball. It has lost some air. The first image is Kei Nishikori's autograph. I don't know much about tennis, so I had no idea who the players were when I got the autographs. This item has been stored at home, so please understand. The tennis ball shown in the picture is not for sale.