Designed for safe blood collection and micro-hematocrit determinations. Excellent sample retention for accurate post-centrifugation analysis. Rapid-fill feature maintains specimen integrity. Available in plain or anticoagulant variants (sodium heparin). Color-coded ends for easy identification: blue for untreated, red for heparinized tubes. Each vial contains 100 tubes, meeting laboratory needs. Ideal for routine blood tests and specialized micro-hematocrit determinations.