Everyone wants to make pages of their schedule books or notebooks neat and easy to look at afterwards but many people have experienced that making messy pages because of changing schedule or simply mistake writing.
For these cases, erasable pens were invented. Thoes unique pens can be erased by specialised erasers. They were invented in Japan but sold in Europe first.
It has been nine years since the erasable pen was first sold and still very popular to many people from kids to adults.