The Duo does not come with a stylus.

I bought this one for mine though: RENAISSER Stylus Pen for Surface, USB-C Charging, Made in Taiwan, 4096 Pressure Sensitivity, 100% Match Surface Pro X/7/6/5 Magnetic Attachment, Rechargeable, Raphael 520C https://www.amazon.com/dp/B0987J23K1/ref=cm_sw_r_apan_i_W09DH9AB4PPPRXVE3RN6?_encoding=UTF8&psc=1

Aftermarket pen is pretty equal in quality and may be even better. This one also charges with type c so you don't have to worry about the small ass battery in the Asus pen.

I've mostly used the stylus for note taking and drawing diagrams and other visual aids for class. I don't think it's good enough for any artistic drawing though.