Here's a triple pin pack!
This is called "The Pixel Pin Set", and it features 3 metal pins of each of the classic characters' "victory pose" from Sonic & Knuckles when you win the game. The character would 'jump toward the screen' and the art you see here would be their 'sprite' but really big & nicely shaded/detailed. Because it was 16 bit, it was still pixelated to a degree, which is where these pins get the title.
The mystery of the set is why it's selling for 30 dollars in the SegaShop. These appear to be ordinary metal pins with quality print-on graphics...that means no enamel or special metals were used. Why are they so costly at 10 dollars per small pin? The shop doesn't list the size but they're probably normal. It's a nice set, and a great idea to make the victory poses into merchandise...it just seems a little pricy. These are a Summer 2018 item.