All Rights Reserved HPLC Vials Aijiren Vials manufactured of Clear, Type 1 Class A or Amber, Type 1 Class B, borosilicate glass,Aijiren Vials have a standard graduated write-on patch for easy filling and identification,Snap caps used with the Aijiren Vial system are a convenient alternative to aluminum seals,Snap caps or aluminum seals ensure a secure seal for samples