Creativity For Kids F906101 West Design Junior Selection Light-Up Heart Large Kit, Multi-Color

I thought it was glass. Its paper

I contact the seller a little while ago about the fact that the pens supplied in this product had run dry and todate I have had no reply - disappointing given that this was a birthday present for a 9yr old and when the main part of purchase doesn't work its a bit poor.A reply to my earlier message would be good.