These are a set of 10 genetics review cards that include GENOTYPE, PHENOTYPE, HOMOZYGOUS DOMINANT, HOMOZYGOUS RECESSIVE, AND HETEROZYGOUS and a few others. They are formatted for Avery business cards product number 8871 but you can print on card stock and cut out just as easily. I feed the paper in once, flip it, then feed it again. I use them for students that may be struggling and need to work during a study hall or after school. They can take the pack with them, self check, then bring them back to me!