Tango Rollerball Silver Ruthenium Square Pattern. In 2018 it was Waldmann`s 100th Anniversary. To celebrate this event, they created another design to the already very popular Tango range. This silver Tango Rollerball is made from 925 sterling silver and has a small Square pattern on it`s silver body and cap. The fittings are plated in ruthenium, which gives it a great contrast. It has a screw cap system and is fully hallmarked. The Silver Rollerball also has an engraving panel. Including a luxury presentation box with a 10 year guarantee and a silver cleaning cloth. The Tango Rollerball is available as a Ballpoint and a Fountain Pen. See below for matching pens, refills and accessories.