We thank Drs Dhillon and Berim for their interest in our article published in CHEST1 on the release of metal particles from Vizishot needles (Olympus Ltd) used for endobronchial ultrasound-guided transbronchial needle aspiration. We believe it is important for users to report their experiences. Most bronchoscopists similarly describe a progressive increase in resistance encountered during the insertion and removal of the stylet into the target during endobronchial ultrasound-guided transbronchial needle aspiration procedures with Vizishot needles. The report by Dr Dhillon and Dr Berim is very interesting because they observed, by the naked eye, dark material on wet gauze used to clean the stylet, even before the stylet had been used. This observation strengthens the hypothesis that there is friction between the stylet and the channel in the needle. The use of smaller stylets may help avoid this friction. For such medical equipment, specifications regarding quality control on the potential release of metal particles would be necessary before the company would be granted approval from the authorities. However, to the best of our knowledge, this is not as yet a requirement.