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Here I use \scalerel* to make a ( as big as a \strut (any bigger and it will affect line spacing). \documentclass{article} \usepackage{scalerel,nicefrac} \begin{document} \scalerel*{(}{\strut}and there is open ball $B(x,\nicefrac{1}{i})$\scalerel{)}{\strut} \end{document} If one prefers a stretched rather than scaled version, just use \stretchrel ...