I made a copy of a slider variable using only pen. The variable may look different on some devices. I may add a future update where you can customize the pen variable, but for now this is what I have. Like if you like. This project uses two variables and 1 sprite not including the example. I spent a lot of time making the colors and effects as close as I could. Comment if there is anything you think I should change.
A little while ago I was asked to replicate a slider variable using only pen. So here it is. Sorry for the bad pixel rendering but I did what I could with pen.