The Bulkfiller is offered in two versions of black brushed Delrin (POM): Flattop and Streamline, each produced in an edition of 100 pieces. Delrin is nearly unbreakable and lies pleasantly in the hand; the size corresponds to a Pelikan M800; the ink volume is about 2.5 ml and so considerably more than on the M800. The Streamline version has a modified titanium clip, a convex-shaped logo on the cap top and an ink window in the grip section. In the forum the Flattop version is mostly preferred; a final recommendation depends on individual preference.