These skateboard riser pads will elevate your skateboard deck by 1/8 inch and therefore there will be less wheel bites. 

Wheel bites can occur if the space between your skateboard deck and your wheels is too small. So if you take a sharp turn the wheel will bite into the skateboard deck and you will fall off your skateboard. 

I like to ride filmer wheels which are bigger and softer for a smoother ride and these 1/8 inch riser pads are just fine with my high Thunder trucks. Print two pads to get an ¼ inch in total for bigger wheels or lower truck.

The first version I printed with PLA, however I assume that it will not survive the first test, therefore I recommend to use PETG because of the forces that occur while skateboarding :)