Bir tükenmez kalem ile yazın. - Write with a ballpoint pen.
Lütfen tükenmez kalemle yazar mısınız? - Would you please write with a ballpoint pen?
Английский Язык - Английский Язык
Определение ballpoint pen в Английский Язык Английский Язык словарь
A pen, similar in size and shape to a pencil, having an internal chamber filled with a viscous, quick-drying ink that is dispensed at the tip during use by the rolling action of a metal sphere (around 0.7 mm to 1 mm in diameter)
pen which has a small rotating metal ball at its point to control the flow of ink