Eraser, in Britain and Australia, eraser is called eraser; ; But in America, rubber is one of the common names of condoms, and the name of eraser is eraser. This difference is often regarded as a joke by Americans. Now there are many kinds of erasers to meet different needs.

The differences between erasers 2b and 4b are as follows:

1, pencil hardness is different, 4B is softer than 2B, 4B is softer to rub, and it is not easy to scratch paper, 2B is more accurate to rub, and it is not easy to erase things that should not be rubbed.

Pencil hardness, 6b, 5b, 4B, 3b, 2B, b, h, HB, 2hb, 3hb, 4hb, 5hb, 6hb, 2B are now in common use (models specified by the college entrance examination and many exams). 4B is mainly suitable for art students. Most lead cores in the market are 2B, and the effect is better when matched with 2B rubber.

2. Their erasing ability is different, and 4B has stronger erasing ability than 2B;

4B rubber can erase 4 units of graphite trace, 2B rubber can erase 2 units of graphite trace and HB graphite trace.