550 RT. Revolutionary ink system for effortless writing. The InkJoy Story: Our mission was simple: To develop a revolutionary ink system that would give you the best in effortless writing. We wanted to give you a pen that starts quickly without dragging, requires minimum pressure from your hand, and delivers crisp, clean lines every time. But most of all, we wanted to bring back the joy to writing, so it felt right to call it InkJoy. We hope that you feel the joy whenever you write with an InkJoy pen. Share your InkJoy experience with us at papermate.com to receive special offers. Tip Seal: The pen you are about to enjoy is sealed for freshness. Please remove the little ball of wax from the tip before use. InkJoy Guarantee: We guarantee you'll feel the joy with every InkJoy pen. Made in China.