Heartless Starters Holo Sticker
A holographic sticker with a matte/satin laminate, gives it a bit of a reflective foil look in certain areas. For this particular sticker, its the eyes, all the colorful parts of their bodies, the heart pika is holding and the heartless ball!
it is about 4.5 inches wide
I need to update the photo because the ones I have now are much thicker than the one shown, very durable!