Marver

It generally is made of a polished steel, brass, or graphite surface attached to a metal or wooden table.

For fine applications such as lampworking, a smaller hand-held implement may instead be used.

As a tool, marvers date back to glassblowing techniques of the Roman Empire and were made of marble.

[1][2] Warm glass is rolled on the marver, both to shape it and as a means of temperature control.

Because the glass comes in direct contact with the marver, it must be kept exceptionally clean in order to prevent points of poor conduction or the transfer of debris into glass worked upon it.