Thank you for taking the time to share your experience. We’re truly sorry to hear that most of the pens were not working and that this caused issues during your exhibition—this is certainly not the quality or experience we strive to provide. To help us resolve this for you, could you please share images of the affected pens and let us know the total number that were not working? We’ll use this information to investigate further and offer the appropriate solution. We look forward to making this right for you.