Wheaton ABC Vials™ are manufactured from Type I clear borsilicate glass. Autosampler vials feature a 40% larger opening which improves sample accessibility while reducing autosampler needle damage. Vials feature a superior thread design which provies a more secure seal for the closure. Capacity: 1.8mL. O.D. x Height: 12 x 32mm. Clear borosilicate glass. Screw Thread Finish: 9mm. Vials are packaged in a recyclable PETE clamshell case to help prevent particulate contamination. ABC vial 9mm screw caps are included and feature red PTFE-Faced Silicone septa liners. (0.005-Inch PTFE/0.035-Inch Silicone.) Cap Material: Natural Polypropylene.