Intuos pen tablets

http://www.wacom.com/products/pen-tablets

Wacom pen tablets are a perfect fit whenever you’re working in creative software.
Benefit from the pressure sensitive pen. Enjoy the intuitive control and natural feel of working with a pen in hand.

Autodesk SketchBook app
https://itunes.apple.com/us/app/autodesk-sketchbook/id883738213?mt=8

related:
https://franzcalvo.wordpress.com/2015/03/16/use-your-tablet-for-creation