kneaded eraser; putty rubber
A soft, pliable eraser used mainly in art and drafting; can be shaped to erase fine details. Often called 練り消し for short.
See also: 練り消し
In drawing, I use a kneaded eraser to add highlights.
練り消しゴムはよく練ってから使うと消しやすい。
A kneaded eraser erases better if you knead it well before use.