Professional golfers change clubs for a variety of reasons. Some try new clubs to improve their overall game, or to make a temporary change based on the course they’re playing. Others use a certain manufacturer’s clubs because they’re paid to endorse the equipment. Still others change with the times, replacing long irons with hybrids, for example. But there is no fixed pattern or time frame within which PGA Tour pros typically change clubs. The decision on which clubs to use is a personal choice for each pro.
In 2010, the United States Golf Association banned so-called square grooves -- which are actually U-shaped -- cut into the faces of clubs with lofts greater than or equal to 25 degrees. The USGA’s reasoning was that the increased spin produced by the square grooves greatly reduced the difficulty of certain shots, particularly shots from the rough. As of the date of publication, PGA Tour players seemed to have compensated sufficiently, making the rules change more of a tweak rather than a revolutionary event.
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According to Callaway Golf Co.'s annual report on Form 10-K for the year ending Dec. 31, 2011, filed with the Securities and Exchange Commission on March 2, 2012, the company owns 19 subsidiaries. They are Callaway Golf Interactive Inc. of Texas; Callaway Golf Sales Co. and Callaway Golf International Sales Co., both of California; Callaway Golf Canada Ltd.; Callaway Golf Europe Ltd. and Callaway Golf European Holding Co. Ltd., both of the United Kingdom; Callaway Golf (Germany) GmbH; Callaway Golf Kabushiki Kaisha of Japan; Callaway Golf Korea Ltd.; Callaway Golf (Shanghai) Trading Co. Ltd. and Callaway Golf (Guangzhou) Technology Service Co. Ltd., both of China; Callaway Golf South Pacific Pty Ltd. of Australia; Callaway Golf Ball Operations Inc. of Delaware; Callaway Golf Cyprus Co. Ltd. of the Republic of Cyprus; Callaway Golf Malaysia Sdn. Bhd.; Callaway Golf (Thailand) Ltd.; uPlay Inc. of Delaware; Callaway Golf India Private Ltd.; and Callaway de Mexico, S.A. de C.V.