Quick question.. what the F? screen print transfer

Screen print transfer  Size: unless otherwise stated, standard adult size approx 11.5 inch HOW TO APPLY Temp:  325 - 350° Pre-press 5-7 seconds to remove moisture/wrinkles Press Time:  10 - 20 seconds Heavy Pressure Hot Peel Do not cover with teflon sheet  See PRESSING INSTRUCTIONS tab for more detailed info & trouble shooting tips Use for 100% cotton, 100% polyester, cotton/polyester blend Actual product colors MAY vary from mock up photo due to device display capabilities and monitor settings.  Every print is different and has different color variations, after pressing.  Please be aware of this before purchase. We do NOT accept returns or exchanges for our products.  We are not responsible for transfers that are pressed incorrectly.  Please make sure you are using the correct material, color, and press settings prior to pressing your transfer.