A dream collaboration between popular stationery brand "MONO" and "Campus" and "Dr.Grip" and "FRIXION." Exclusive "Sheer Stone" pattern for a loose-fitting adult linking outfit. A 0.27 inch (6.7 mm) diameter mono eraser is perfect for A-ruled and B-ruled notebooks, and removes cleanly from a single letter. This is the definitive portable, retractable eraser.