D20 Critical Hit dice from Dungeons & Dragons. This enamel pin is a perfect gift for that Dungeon Master in your life. 
You can pin it on your purse, back pack, jacket, t-shirt, hat, or other apparel and accessories. 
By Paul Simic
1 Inch ( 25mm)
Soft Enamel
Black nickel plated backing
Iron Base
Double needles
Metal Clutch
Limited supply