From the lowest bleed septa material in their caps to the most insert glass vial material, Vial,screw,250uL,PP,cert,100PK Micro-V Poly. 250 ul 5190-2242 5190-2242 PK 100 100 pack Screw Top Vials Vial,screw,250uL,PP,cert,1000PK Poly. Poly. 250 ul PK ...