These are the detail on how the FireStar Fire Piston works;
With a single push, tinder placed in the end of the piston is spontaneously ignited by the heat of compression, instantly becoming a glowing ember with no more effort than lighting a match. Literally, fire with air… The new FireStar features precision CNC manufacturing and state of the art compression fire starting technology! The compact size is perfect for pocket, pack or belt carry.
The FireStar Fire Piston is priced to start from $60 (£40)
Source: Cool Material