Signatures are of :-. The size of the Balls are 2 1/16 in ( 52.5mm ). Kyren Wilson, Judd Trump, John Higgins, Mark Selby, Ronnie O'Sullivan, Mark Williams, Luca Brecel. Mark Allen, Neil Robertson, Ding Junhui, Barry Hawkins, Zang Anda, Si Jahui, Xiao Guodong.