Tập đoàn Thiên Long - Sức mạnh tri thức Thiên Long Group,sức mạnh tri thức, tập tô chữ, bút chì, bút ký, colokit, văn phòng phẩm Thien Long ’s writing instruments and stationeries (TL brand name) includes traditional product lines such as ballpoint pens, gel pens, rollerball pens, fineliners, etc. This is the long -standing product category of the Group from early days of establishment and currently leading the domestic market with more than 60% of market share.