Positional guides encompass a wide variety of devices meant to improve a player's stance or swing. Lasers attach to the shaft of a putter and project a "putting line" onto the ground. Specialized tapes attach to the clubhead and provide clues as to how the head is hitting the ground or the ball for future correction or club adjustment. These are also illegal in tournament play, but are invaluable while practicing.
A tee is an object (wooden or plastic) that is pushed into or placed on the ground to rest a ball on top of for an easier shot; however, this is only allowed for the first stroke (tee shot or drive) of each hole. Conventional golf tees are basically spikes with a small cup on the head to hold the ball, and are usually made of wood or plastic. Wooden tees are generally very inexpensive and quite disposable; a player may damage or break many of these during the course of a round. Plastic tees are generally more expensive but last longer. The length of tees varies according to the club intended to be used and by personal preference; longer tees (3-3.5") allow the player to position the ball higher off the ground while remaining stable when planted, and are generally used for modern deep-faced woods. They can be planted deeper for use with other clubs but then tend to break more often. Shorter tees (1.5-2.5") are suitable for irons and are more easily inserted and less easily broken than long tees. Other designs of tee exist; the "step tee" is milled or molded with a spool-shaped upper half, and so generally provides a consistent ball height from shot to shot. The "brush tee" uses a collection of stiff bristles instead of a cup to position the ball; the design is touted by its manufacturer as providing less interference to the ball or club at impact, for a straighter, longer flight.
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