Pentel Hi-Polymer Eraser ~ Student Size is 1.75" x 0.5" x 0.75", high quality plastic eraser that provides super high performance. The Pentel Hi-Polymer Eraser provides super clean erasing even with very light pressure. The nonabrasive eraser leaves a clear, clean surface. This eraser has been shown to possibly help standaridzed test scores due to providing a more clear, clean surface.