When Peachtree Road Race runners receive their numbers this month, they’ll notice something new attached: a colorful strip with a silicon chip inside, their key to timing the run.

For the first time, all 55,000 runners will be timed during the annual July 4th race. Until this year, only seeded runners and those in “Time Group One” received electronic timing devices for the 10K. The new time tracking tags are disposable, which eased officials’ fears of a tag-return bottleneck after the race.