5mL Round Bottom Polystyrene FACS Tubes With 35um Strainer Cap, STERILE, 12x75mm. Each FACS tube is notched near the neck-opening for a perfect fit on multiple FACS equipment including FACS systems from BD Biosciences like the Calibur, Accuri, FACSverse, Aria, Celestia, LSRFortessa, FACSCanto, FACSMelody™ Cell Sorter, and other models.