Eboya Ricchiku Medium Kaze C-CEboya Ricchiku fountain pens are hand crafted from ebonite hard rubber to resemble the notched appearance of natural bamboo. The Ricchiku is available in the Large and Medium sizes and in two different colors: Akebono Red and Kaze Blue Green. Eboya pens are individually handcrafted in a process requiring a minimum of three to six months. The Eboya Ricchiku Medium Kaze Blue Green is made from hand crafted ebonite hard rubber and is available with your