Paper Mate InkJoy 100 Retractable Ballpoint Pens Medium 1.0mm Tip Blue (Pack 20) Inkjoy is a revolutionary new hybrid ink system from Paper Mate that is designed to start quickly without dragging and deliver crisp clean lines without smearing. The Inkjoy 100 is a great everyday ballpoint pen with a triangular shape for comfort in the hand and a transparent colour-tinted body.