This is Toy Island's full set of "3D Figural Erasers". One is pictured elsewhere on School Supplies. Were they sold separately? With this set you can see Big, Sonic, Knuckles, Tails & the Neutral Chao. Their features/details are cut-in lines of texture (hard to see in the photo) Each one is a solid color & totally made of eraser-rubber-material. This makes them likely to be fragile, especially things like arms & legs, as you know eraser rubber is flexible but not too sturdy. The Chao has the best look here.