Geoffrey Early 5 When I first received the set of markers, 2 of them were empty. However, through Amazon, I was able to contact the vendor. In 3-4 days, I received a replacement set of markers. The vendor wrote very kind letters and took care of the problem quickly.Since then, I have used the markers for a month or so. I am happy with the colors and how well they write. My students can easily see what I wrote, even from the back of the classroom.