sand eraser; ink eraser
A rubber eraser containing fine sand particles, designed to remove ink by abrading the paper surface. Common in stationery contexts.
You can erase ballpoint pen writing with a sand eraser.
Compound of 砂 (すな, 'sand') and 消しゴム (けしゴム, 'eraser'), referring to the sand-like abrasive particles embedded in the rubber.