Buy K2 Spice Spray On Letter Now! K2 Spice Spray On Letter. Each letter contains 25 ml=0.845351 fluid oz of liquid k2 spray. When ordering, if you’re sending to an inmate, in the notes section you can type any relevant details on the inmate or special message. We will use that before sending. Each paper is Regular copy paper Let us know If you need plain/empty k2 paper