Amazon.com: BoxWave Stylus Pen Compatible with Lenovo ThinkPad Yoga 11e (5th Gen) (11.6 in) (Stylus Pen by BoxWave) - AccuPoint Active Stylus, Electronic Stylus with Ultra Fine Tip - Metallic Silver :
Amazon.com: Lenovo Active Pen 2, 4096 Levels of Pressure Sensitivity, Customized Shortcut Buttons, for ThinkPad X1 Tablet Gen 2, Miix 720, 510, 520, Yoga 720, 920, Replacement Tips Included, GX80N07825 : Electronics
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Lenovo ThinkPad P40 Yoga (20GQ/20GR) original Active Pen - sparepartworld.com