Kim Taek Soo Brand

KTS has quite a few Jpens now. Your top 3 are Prime Blue, XO and Finally Gold. Gold is the one you see in the wooden box. I own Blue and XO I am working on acquiring a Gold. They are Both 10.5mm and weigh a little over 100g . Compared to Gmax they are a little heavier and stiffer but thats cause they are  thicker . I consider these Korean penhold blades (fast & heavy). In terms of grain quality compared to other blades  Prime Blue= Cypress S, XO= Gmax, Gold =KKT/Darker.  The bad part is the cost and availability. KTS is a Korean brand and mainly only sell in Korea. There are a few vendors outside Korea but availability can be a problem as well. Cost is also a problem . Prime Blue is typically $200-$250 shipped, XO is around $450+ shipped and Gold well its about the price of a  new Bfly KTS red.... All this being said they are very nice blades and will be nice collectibles . The other people that I know who own them  love them.