What makes the Osprey Pensbrand of fountain pens unique is our family of modular threaded units. Our Luxury Milano or Classic Scholar fountain pensshare the same threading and have interchangeable nib units. In 2019, we are excited to introduce our Flexpert series of nib units. A Zebra G titanium nib or a size 5.5 stainless steel flex nib is fitted with custom ebonite feed along with a custom Converter. Our Modular inserts allow you to customize, configure, and upgrade your Scholar/Milano platforms over time to suit your own specific writing needs. As part of our product design philosophy, we feel that it is important to allow users to save money and to be able to retrofit new developments into their existing Scholar and Milano fountain pens.