Tourna ScoreTube Tennis Net Post Score Keeper Patented scorekeeper fits right over the round net post and secures very tight with an adjustable clamp Use old tennis balls to keep score No moving parts, so there is nothing to lose, nothing to break or get stolen Weather sealed so it stays looking great for a long time! Numbers are on both sides so you can read it no matter what side of the court youre on Does not fit square or irregular net posts. An S-hook is provided for fence mount if necessary White Color