Ends can be sealed by flame, sealing clay or patented caps ·Manufactured from low-taper, soft glass ·Tubes are packed in plastic vials with reclosable snap-lock caps to maintain cleanliness ·Blue band indicates nonheparinized tube ·Interior surface of heparinized tubes is evenly coated with ammonium heparin (4 to 7 USP units), which will not interfere with sodium determination ·Length: 75mm ·Inner diameter: 1.1 to 1.2mm ·Wall: 0.2mm ±0.02mm ·100 Tubes per Vial