The Zento Signature Craze: First Look at Uniball's Highly Sought-After New Rollerball
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The Zento Signature is the flagship model in Uniball’s new Zento lineup, boasting an all-new ink formulation that has been six years in the making. While other pens in the Zento series are now easy to find, the Signature pen continues to be highly sought after and hard to come by.

The Zento Signature is the new Uniball Rollerball, with a new ink formulation they said took six years to make. Here is a video talking about it.