Best Friend Bracelets with my two favorite from Gotham they come together to say Partners in Crime, Riddler's bracelet has green beads with a question mark. Oswald's bracelet has purple beads and an umbrella charm.
You get both bracelets can be made into necklaces as well.
Penny gives you an idea of the size. This item is not Official DC Merchandise but a fan work inspired by the fandom.