Ping (usually spelled PING) has been in the golf club business since the late 1950s. Founded by Karsten Solheim, it became initially well-known for its unusual putters. Later, it brought a process called "investment casting" to the manufacture of irons, which allowed for much more forgiving designs than the forged, blade-style clubs that had been common before. Based in Arizona, Ping now manufactures a wide variety of clubs, bags and accessories; it competes with Titleist, Callaway and TaylorMade; and it has achieved a loyal following among both amateurs and professionals on the PGA, LPGA and Champions tours. Many players who no longer carry a full bag of Ping clubs keep one or two of the company's clubs on hand, mainly its sand wedges and, of course, its putters. Tiger Woods' current putter is made by Titleist/Scotty Cameron, but it's based on a Ping design that Woods used as an amateur. Tiger also still uses a Ping putter grip.