The sample collection area of the 903 Protein Saver Card contains five half-inch sample area circles. Each sample area circle holds 75 to 80µL of sample or blood. Wrap-around cover has spaces for name and date of collection and is imprinted with the universal biohazard symbol in accordance with USPS regulations. It fits into Whatman™ foil barrier zip sealing bags for storage (See Whatman™ #10534321). These protein saver cards are for research use only.