1The pen rod is made of high quality plastic, good air tightness, ensure the longer use. 2Color vivid, have layer sense, infiltration color, overlay, mix color effect is good. 3Water-based dye ink: odorless, environmentally friendly and non-toxic, safe for children. 4High quality fiber pen tip: it is compact and breathable, which can guarantee the smooth ink and durable writing. 5Ideal for coloring books, card making, lettering and scrapbook, journal, paper crafts and stamping projects etc.