454320 1ml light blue white 13 x 75 Sodium citrate 3.2%, sandwich tube, low draw volume 454321 2ml light blue white 13 x 75 Sodium citrate 3.2%, sandwich tube, low draw volume 474321 2ml light blue white 13 x 75 Sodium citrate 3.2%, sandwich tube, low draw volume, transparent label 454325 3ml light blue black 13 x 75 Sodium citrate 3.2%