Stripette® Polystyrene Serological Pipets are molded from virgin polystyrene and are ideal for sterile serological and tissue culture applications. The easy-to read black ascending and descending graduations simplify fluid measuring and dispensing - negative graduations for extra working volume. Exclusive graduation alignment mark allows graduations to be brought into the line of sight quickly. They are color-coded for quick size identification. Accuracy is ±2% at full volume. Sterilized by gamma radiation for immediate use.