2ml clear screw autosampler vials USP 1 expansion 33 with patch 8mm/9mm V823 V923 - aijiren Products Made In China, China Manufacturer. 4ml, 15*45mm Vials are manufactured of Clear, Type 1 Class A or Amber, Type 1 Class B borosilicate glass and include a write-in patch for sample identification. our products are the same as aijiren and Shimadzu