They all seem to be working fine.
My Supply Room: 2013
Pentel Tough Name Oil-Based Marker Pen - Fine Point - Black
Pentel Watercolor Stick Vistage 12 colors GSS1-12SW Sweet Mix
VTG Pentel Color Pens S360-36 Fine Point Yellow Carrying Case
Pentel of America, Ltd. Color Pen Marker, Black - 12 Pack
Customer Feedback
What type of pen is the best for outlining drawings? - Quora
All markers pretty much work. There are a few that are running low. Some of the colors that originally came with the pack are missing. Case has stains
Vintage PENTEL Color Pens Fine Point Markers Original S360-36 Taiwan Rare
Pentel Color Pen, Set of 36, Assorted (S360-36