Silver Rollerball Tango Barley Pattern. The silver Tango Rollerball is made from 925 sterling silver and has a Barley pattern. This silver Tango Rollerball has a screw cap system and is fully hallmarked. The Tango Silver Rollerball is one of our most popular designs and also has an engraving space. The Silver Rollerball is in a luxury presentation box. Including 10 year guarantee and silver cleaning cloth. Matching Silver Ballpoint and Silver Fountain Pen available. See below for matching pens, refills and accessories.