Pro shops are often managed by a house pro, a professional player, and overseen by a General Manager who is employed by or acts as a consultant contractor to the venue, though shops may instead be run by a retail manager at larger venues (or those too small to attract a pro). House pros are often available to advise on game-related issues such as rules details or the proper equipment for particular needs and conditions, and sometimes also for instruction such as group lessons or one-on-one training (usually for a fee). House pros sometimes also perform paid personal equipment maintenance, such as restringing tennis racquets, drilling and fitting bowling balls, re-tipping pool/snooker cues, skate sharpening, etc., depending upon the sport.