(2) The width of the bag mouth shall conform to the specifications formulated by the World Professional Billiards Association and the Snooker Federation (WPBSA) (the distance is 85.0mm).
Kick-off line and bottom area: 737mm(29in) from the inner edge of the bottom dike and drawing a straight line parallel to the bottom dike is called the kick-off line; The area between the tee line and the bottom bank is the bottom area.