ThisReplacementLeather Zippered Pen Pouchis suitable for our Slip-N-Zip Pen Pouch , A5 or B5 sizes folios.Butof course it can be used externally. Pen Insert: 150 mm x 90 mm (6.00\” x 3.5\”) Holds up to 150 mm (6 inches) sized pens, including oversized pens like MB 149 or Pelikan M1000 100% vegetable tanned cow leather Hand stitched usingwaxed polyamide thread The edges are beveled, waxed and burnished for a finished look