This soft 5"-7" model makes a great teaching tool represents the Human Spermatozoon (Sperm Cell) which when combined with a egg cell is a sexually shared condition. Includes a leaflet on contraceptive choices available and a leaflet on SSI's. The body cells represented by these models are too small to be seen by the eye without the use of microscopes, care should be taken when using these models in a educational / teaching setting not to misrepresent the body cells as being as large as the models.