Comet Trading Company was a broomstick company established in 1929 by Randolph Keitch and Basil Horton, who were both players for the Falmouth Falcons.
Its first release was the
Comet 140 in the same year, and their patented Horton-Keitch Braking Charm made it less likely for Quidditch players to fly offside or overshoot the goals. The latest Comet released sold more items on its first day than any other broomstick.
Comet series brooms featured the
Horton-Keitch braking charm, which gave Quidditch players much more control over their movements.
Models produced include:
Comet 140, Comet 180, Comet 260 and Comet 290.
Before his father bought the
Slytherin Quidditch Team new Nimbus 2001s (as a bribe), Draco Malfoy had flown a Comet broom.
 Cho Chang, Seeker on the Ravenclaw Quidditch Team, also rode on a Comet broomstick.
As a member of The
Advance Guard Tonks meets Harry Potter for the first time. After meeting him she is envious of Harry's Firebolt, as she herself rides an old Comet.
 magazine reviews the latest Comet brooms. Which Broomstick
During the 1996 tryouts for the
Gryffindor Quidditch team a Comet broom crashed, which resulted the rider throwing a tantrum.
A Comet was one of the brooms involved in a 'broom smash' over the
River Mersey prior to the last concert date of Celestina Warbeck's Flighty Aphrodite tour. 
Splinter and Kreek's, presumably a second-hand broom shop (though it's possible they sell new brooms as well) sells secondhand Cleansweep brooms..
Notes and references
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