I'm referring to the Wacom tech compatible with the Samsung Tabs and Notes, Zbook X2 or the upcoming Samsung Book Flex. I bought the very expensive Zbook X2 pen for using on my Tab S3 and it works fantastic, It works better than my (old) Cintiqs and Intuos ones, the parallax is non existent. But I constantly miss not having a second side button. I use one for color picking and the other one to change brush size (in Paint Tool Sai for example). So does anyone know if it exists a pen with two side buttons? I have searched a lot but so far I have found none. Thanks.