JSI High Quality Borosilicate 3.3 Glass Beakers - 1000 ml with Graduation Marks, Pack of 1

It is made up of glass alright, but don't know it is borosilicate.The doubt arised when I saw the measuring scale printed on it to be slanted and not straight. So it definitely is not an accurate measuring instrument.At the least they could have got the scale in a straight line.Not of a very good quality.It looks like a defective piece.