This is a magnetic P-FLAT sheet, for 3D printers with a build size
 
184*184
257*257
300*300
 
There are currently many different finishes to choose from - Bifrost, Graffiti, Pixel arrow, Starry Vine, Cycloid, and Carbon Fiber. These have a magnetic back to them. They are intended to be placed directly on top of the magnetic build plate surface, followed by performing a new bed level calibration.  Anything that is printed face down, will have the effect imbued upon it.
 
Use very slow speeds for first layer adhesion, generally around 25-40mm/s, with 55-65 degree build plate temp. These are a consumable, over time the effect will be less prominent. Wait for the build surface to cool to between 40-45 degrees Celcius before removing the print, or you'll risk damaging the surface. Isopropyl alcohol is recommended to ease removal.