This listing is for two (2) factory-sealed packs of CORNING PYREX 9820 Culture Tubes. Each pack contains 24 pieces of 16 x 100 mm borosilicate glass culture tubes, totaling 48 tubes. These high-quality laboratory glassware items are ideal for various applications in research, educational, and medical settings. Manufactured by Corning Glass Works under the reliable PYREX brand, these tubes are known for their durability and chemical resistance.