This kit lets students study both ABO and Rh blood types at the same time. The serum in this kit does not require refrigeration and has no expiration date. No special equipment or technique is required, and the entire activity is easily completed in a single lab period including introduction, activity, observation, and discussion. Includes a specially designed Slide Guide® and individual student worksheets. Complete for 30 students. WARNING: Choking Hazard. Small Parts. Not for children under 3 yrs.