300ul micro volume insert for 1.5ml vials from Amazon-Aijiren. Aijiren HPLC Pre-Slit 9-425 Screw Thread Vial Blue Caps, 9mm. Vials:Polypropylene. Pp insert flat tube 250-350 µL into the standard 1. 5 ml. Insert volume: up to 300 ul. Aijiren autosampler vial specifications: material: polypropylene fused insert Volume: 300ul Dimensions: 12*32 mm