Paper Mate® InkJoyTM Quatro features the revolutionary InkJoyTM writing system, giving you the best in effortless writing. The InkJoyTM writing system starts quickly without dragging, requires minimal pressure from your hand, and delivers crisp clean lines every time. Vibrant colours. Wide buttons for easy usage. Button angles have been rounded up for more comfort in use. Slimmer barrel: easy to handle.