A mug shaped like one of the colorful soft plastic finger puppets that became popular in the 1980s.

From Ohana Is Dead:

"From the depths of the long forgotten grocery store gachapon comes our latest mug The Master of Puppets! Just like the toys of yesteryear, our little monsters are super bright and colorful, and you don't know what color you're going to get until you open up your package. Each mug is unique and lovingly made in Astoria, OR by our good friend Munktiki. The Master of Puppets will be an ongoing series for us until we reach 100 total mugs."