These are hard enamel pins with black nickle plating and two rubber pin backs!
I've started a new enamel pin series in this particular style - all the other weebean pins are actually inspired by these first designs I made of the characters from the visual novel Butterfly Soup by Brianna Lei! It's a wonderful game, be sure to check it out!
B grade pins have slight visible flaws, such as issues with screen printing, flecks in the enamel or under filled areas!
Here are the approximate heights of each enamel pin:
Noelle: 1.5"
Akarsha: 1.5"
Diya: 1.7"
Min-Seo: 1.4"