https://www.amazon.com/Lenovo-Digital-4XH0R14769-Think-Options/dp/B07SGMRK5F

All of the Wacom AES-enabled thinkpads use these. X1 Yoga (all generations), L and X3xx Yogas, X1 Tablet (all), X12 Detachable, P1/X1 Extreme with touch. You'll have better luck searching "lenovo pen tip".