ore in the hands of a professional golfer. Traditionally these clubs had heads mad e of a s hardwood, hence the name, 6s but virtuall 4q86s y all modern woods are now made of metal suc h as titanium, or of composite materials. Irons are shorter-shafted cl 6sbs with a metal hea d primarily consisting o sf a flat, ang 86s led striking face. Traditionally the clubhead was for ged from iron; modern iron clubhea 4q86s ds are investment-cast from a steel alloy. Irons of vary ing loft are used for a variety of shots from virtually 6s anywhere on the course, but most of ten 4q86s lfor shorter-distance shots approaching the green, or to get the ball out of tricky lies such as sand traps. The thi srd class is the putter, which evolved from the irons to create a low-lofted, balanced club designed to roll the ball along the green and into the hole. Putte rs are virtually always used on the green or in the surrounding rough/fringe. A fourth class called hybrids, evolved as a cross between 86s lwoods and irons, and 6s are typically seen replacing the low-lofted irons with a c 4q86s lub that provides similar distance, but a higher launch angle an d a more forgiving nature. A maximum of lubs is allowed in a player's bag at one time during a stipulated round. The choice of clubs is at the golfer's discretion, although every club must be construc 86s lted in accorda nce with parame 86s lters outlin sed in the rules. Clubs that meet these parameters are usually called iolation of these rules can result in d 6sisqualification. The exact shot hit at any given time on a golf course, and which club is used to accomplish the shot, are always completely at the discretion of the golfer; in other w 4q86s ords, there is no restriction whatsoever on which club a golfer may or may not use at any time for any shot. Golf balls 6sare spherical, usually whi 86s lte (although other c solours are allowed), and minutely p ock-marked by dimples that 4q86s decrease aerodynamic drag by increasing air t 4q86s urbulence around th e ball in motion, which delays "boundary layer" separation an
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