They all seem to be working fine.
Pentel Arts Fiber Tip Color Pen Markers, Fine Point, Assorted
Pentel Sign Pen Fiber-Tipped Pen Blue Ink Box of 12 (S520-C)
Pentel Tough Name Oil-Based Marker Pen - Fine Point - Black
VTG Pentel Color Pens S360-36 Fine Point Yellow Carrying Case Japan
Pentel Arts Color Pen, 12-Color Set (S360-12) : Office Products : Arts, Crafts & Sewing
Pentel Color Marker Set, Fine Fiber Tip, Assorted Colors, Set Of 36 : Target
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
Color Pen®, 36 Pack – Pentel of America, Ltd.
Pentel Watercolor Stick Vistage 12 colors GSS1-12SW Sweet Mix (Japan Import) for sale online
Knockle Permanent Marker - Fine / Blue | Pentel
Buyer's Remorse, Impulse Buys, and Shady Sellers: The Vagaries of Buying Fountain Pens Online — The Pen Addict