Black Leather Rollerball Solon Sterling Silver. The cap of the Rollerball is made from Sterling Silver with a pinstripe pattern. The lower part of the pen has been covered with Genuine Nappa leather. The leather has been dyed in matt black using natural dyes. The leather and silver Solon Rollerball has a screw cap system. In luxury black presentation box including a 10 year guarantee and a silver cleaning cloth. Also available as a Pencil, Ballpen and Fountain Pen. The Silver cap has an engraving panel. See below for matching pens, refills and accessories.