From the Disney Pins Blog web site, this is a special pin trading event on December 4, 2021. The Heroes Vs. Villains set has an array of Disney characters of good versus evil to collect. From The Great Mouse Detective film, there is a set called "How to Be a Hero or a Villain" series with Basil of Baker Street and Professor Ratigan, and Sidekicks Mystery Pin Set with Dr. Dawson and Fidget the Bat.