Wacom on Twitter: "@This1sWrong Hi Brit, thanks for reaching out. I'm so sorry to hear this. The default pen for the Intuos 4 is the Wacom Grip Pen, model name KP-501E-01, and
Amazon.com: Wacom WACOM 2X KP501E2 Grip Pen for Intuos and Cintiq : Electronics
Amazon.com: Wacom WACOM 2X KP501E2 Grip Pen for Intuos and Cintiq : Electronics
For Wa Com Grip Pen (kp-501e) For Intuos 4 / 5 / Pro Cintiq - Tablet Pen - AliExpress