The Montegrappa Heartwood rollerball pen is made out of olive wood with stainless steel trim, and boasts the famous 1912 logo on the cap top. The pen weighs 34 grams and measures 143 mm in length and 15.6 mm in diameter. 13 13 This item is offered in brand new condition and includes the manufacturer s box and papers. Montegrappa Unisex Rollerball. SKU: ISFOWRIO. Color: Multi-Color. Montegrappa Heartwood Olive Wood and Stainless Steel Rollerball Pen ISFOWRIO.