Shrink Plastic Sheets -Made of high quality PVC,0.3 thickness,one side frosted one side smooth.Shrinks to 30% of its original size after heating. Easy To Use-Bake 2-3 minutes at 320 degrees.Watch until it curls up,then flattens back out,THEN bakes another 30 seconds after it is flat.Take them out of the oven and quickly press down with a heavy object to even out any little bumpy bits before it goes solid.