One time offering of Vintage Marble stock COE 104. There is not a lot left of each design. Marble Stock is the glass used to make the bodies of glass pens, and of course marbles. However, any solid color cans be used too.. This section also includes the ribbed rods to make the ends of the glass pens. One rod is 13 inches makes several pen tips.We have found decent ink at Dick Blick Art Supplies.