My set had 2 defective caps. I could not get the caps off, so when I forced the cap off the liquid came pouring out. This happened on 2 markers. I am not sure if the third is defective I did not bother with it due to the mess the first two made. I did watch the video before trying to open these markers. I ruined my project and I lost 10 bucks. I will not buy these again. The wink of Stella is much better and very easy to use.