Pool uses different equipment from carom billiards. In addition pool tables having pockets, the balls for pool are generally smaller and range from in diameter to in diameter. By comparison, carom billiard balls are generally , or . While UMB, the International Olympic Committee-recognized world carom billiards authority, permits balls as small as , no major manufacturer produces such balls any longer. For that reason the normal standard is . Modern pool tables range in size from by , to by . Modern cue sticks are generally long for pool while cues prior to 1980 were designed for "straight pool" and had an average length of , while carom billiards cues are generally long.