Score reels are mechanical rotating drums, each one displaying a single digit — zero through nine — painted on its face and driven by a solenoid one click at a time. To show a score of 47,300, five separate reels would spin to their correct positions, each advancing with a satisfying mechanical clunk. When a player rolled the score past 99,990 points, the reels would quietly cycle back to zero and start again.

Gottlieb introduced the first practical score reel displays in the late 1940s, and they became the universal standard for the Electromechanical era. Bally, Williams, and Gottlieb each developed their own reel assemblies, usually six digits arranged across the backglass and visible through the painted artwork. The arrangement of those reels — and the artwork designed around them — became part of each machine’s visual identity.

The reel’s sound is inseparable from the character of EM pinball: the rapid-fire clicking of bumper hits accumulating, the slow deliberate turn of a bonus reel advancing one hundred points at a time, the satisfying final clunk when a thousand-point shot lands. When Solid State electronics arrived in the late 1970s and Alpha-Numeric LED displays made reels obsolete, many players mourned the loss of that sound as much as anything else.