Thirty three (11 of each image) science based tattoos come in this variety pack. Our original artwork features DNA, the Atom and the brain. The tattoos range in size from .75 inches to 1.25 inches in width and height- DNA and the brain are larger, the atom is smaller. To put them on, you simple peel back the plastic protective coating, place the tattoo on your skin face down, use a wet wash cloth to dampen the paper for about 45 seconds, then slide the paper away. The tattoos will last from a few days to 1 week, depending on your lifestyle. They come off with strong scrubbing with regular soap and water. Great for classroom prizes or for science themed parties