the Ladies Professional Racquetball Tour (LPRT) is the women's professional organization. Both began in the 1980s. Equipment This court and equipment are required for playing racquetball: A racquetball court; fully enclosed indoor or outdoor with a front wall. The standard racquetball court is rectangular: 40 feet long, 20 feet wide, and 20 feet high with red lines defining the service and serve reception areas. There are variations on the standard court with some courts having sidewalls that don't extend the full length of the court and some courts don't have any sidewalls. The "service box" is formed by the short line (a solid red line running the court's width parallel to the front and back walls at a distance of 20 feet) and the service line (which runs parallel to the short line and is 15 feet from the front wall). Within the service box there are two sets of lines perpendicular to the short and service lines. One set of lines is 18 inches from, and parallel to, the side walls. Along with the short line, service line, and side wall these lines define the doubles box, where the non-serving doubles partner stands during the serve; 36 inches from the side wall is another set of lines which, along with the short line and the service line, define an area that the server must not enter if he wishes to hit a drive serve between himself and the nearest side wall. The receiving line is a parallel dashed line 5 feet behind the short line. Other equipment needed: A racquetball; a dynamic (bouncy) rubber ball of 2.25 in. (57 mm) diameter A racquetball racquet; no longer than 22 inches Racquetball eyeguards (mandatory during competitions; some recreational players play without eyeguards but this is not recommended, as being hit in the eye by the ball can cause serious injury and/or permanent vision damage). Racquetball differs from other racquet sports as most competitive players wear a glove on their racquet hand for the purpose of getting a better grip on the racquet (similar to golfers using a glove when driving), but gloves are optional equipment. Also, players usually wear a comfortable short sleeved shirt and shorts, as well as racquetball court shoes designed for enabling quick lateral as well as forward and backward movement. Ball colors Racquetballs are manufactured in a variety of colors such as blue, green, purple, black, red,