9mm Black Screw Cap, Red Silicone/ Clear PTFE Septa: Standard HPLC Septa: 60: 1: 100: Order: 60180A-SC9STS1: 9mm Black Screw Cap, Red Silicone/ Clear PTFE Septa, Slitted: Standard HPLC Septa: 60: 1: 100: Order: 60180A-SC9STB1: 9mm Blue Screw Cap, Silicone/PTFE Bonded Septa: Standard HPLC Septa: 45: 1: 100: Order: 60180A-SC9STBS1: 9mm Blue Screw Cap, Silicone/PTFE Bonded Septa, Slitted