Besen Masterpiece or Besen is the in-house brand for Bestpen pen and ink store in Seoul, Korea and their online shop at Bestpen.kr. Besides their own branded inks, they have collaborated on a wide range of inks and other stationery products with various companies and influencers. These include paper and notebook products, leather and wood products, pens, and inks. They are also behind the Jam Ink brand of inks.