Ystudio Classic Revolve Black Roller mypensystem Hofkwartier Groen Pen tip:Fine (F) Hofkwartier Groen The collection is made of transparent acrylic resin in colors that refer to gemstones such as emerald ystudio makes products for daily use and believes that the value of simplicity and durability is very important The Brassing Revolve Rollerball Pen is notable for its exquisite appearance