Replacement Filters for Smoking Experiment (TSS-2800-KW) * Let your students clearly see the dangers of smoking * This kit exposes the amount and nature of the tars and nicotine produced by cigarettes * A simple apparatus draws smoke from a lighted cigarette through a white fiberglass filter * The resultant residue is compared with a calibrated color chart * This powerful experiment is great for students from elementary to college * Includes: 25 filters * Grades 6-12