This valuecraft pack of two hobbycarft putty erasers is exact opposite of plastic erasers its flexible and doesnt disintegrate nor does it damage your drawing surface soft and pliable it is somewhat similar to blu tac which you can shape therefore the putty eraser not only lets you erase large areas with nothing breaking off but you can also shape the putty to be more precise in what youre erasingthe other technique artists use with the putty is similar to drawing as you can slightly r