These sterile polystyrene products are differentiated by their graduation markings and color coding. They feature exceptionally crisp, dark, easy-to-read printing with both reverse (except on 1 mL) and negative graduations. An exclusive graduation alignment mark allows graduations to be brought into line of sight before complete removal of the wrapper. Easy-to-read, high-contrast graduations allow the user to accurately measure and dispense culture media and reagents. Negative graduations provide extra capacity. Color-coded pipets facilitate correct size selection.