Here are 5 'emoji style' cute/chibi type character pin buttons.
These are 'mini button pins', where they're smaller than normal but the same round shape with rounded edges. Each pin has one character and a square/tile background with the color of that character. You can get Sonic, Tails, Knuckles, Amy & Shadow. Each is shown sitting, faced forward. ST & K all are smiling with their eyes (in this case...pupils..) shut while Amy looks cheerful & Shadow looks a bit bored with his frown.
It's a cute little set to put on small-size buttons, so the art goes with the theme of things contributing to the cuteness. These are likely to be a late 2019 item.