All of HPLC vial is in wholesale price. Those HPLC vial can be also equipped with micro-insert, which used for precious sample analysis. 300ul PP micro vial from China Manufacturer, Manufactory . 300ul Micro-Insert,31*6mm,clear glass,flat bottom; suits for ND9 Vials V181 1ml shell vials,1st hydrol glass,clear, 8mm PE-Plug,soft, without