The jack or kitty, as the white earthenware ball to which the bowler bowls is called, is round and 21 to 21 in.
The bowler delivers his bowl with one foot on a mat or footer, made of india-rubber or cocoanut fibre, the size of which is also prescribed by rule as 24 by 16 in., though, with a view to protecting the green, Australasian clubs employ a much larger size, and require the bowler to keep both feet on the mat in the act of delivery.
In the south of France it is rather popular with artisans, who, however, are content to pursue it on any flat surface and use round instead of biased bowls, the bowler, moreover, indulging in a preliminary run before delivering the bowl, after the fashion of a bowler in cricket.
Every bowler should learn both forehand and backhand play.
On crown-greens it is customary to use a small biased wooden jack to give the bowler some clue to the run of the green.