Our range of MS certified vials, made from high quality materials, are tested for residual compounds by GCMS and LCMS to facilitate consistent results time and again. High-quality glass offers the lowest ion content possible to reduce sample loss and contamination. Specifications: Quantity: 100 Volume: 20 mL Neck Size: 18 mm Vial Material: Clear Glass Cap Style: Screw Top Bottom Style: Round Bottom Certification: MS Certified Features: Write-On Spot and Fill Lines