about 5 inches
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Depends on what type of eraser you have. I measured the original pink eraser 5cm long.
The length of a standard eraser can vary depending on the brand and type, but a typical eraser is around 25-30 millimeters in length. This measurement is equivalent to approximately 1-1.2 inches. It is important to note that there are erasers available in different sizes, so the length can vary.
they can be bought in what ever size you want.
Blackboards are different sizes. You need to measure the particular blackboard with a ruler or tape measure to get the width. The width is the shorter side (the length is the longer side).
paper clips beads finger nails length of an eraser