G-Tubes™ - Microcentrifuge Tube • MaxSeal™ SnapCap • 0.6ml, 1.5ml, and 2.0ml sizes • 8 colors • Rated to 30,000 X G • Boilproof • Ultra-Low Retention available • Flat Larger Cap for sample ID • Etched writing surface • Certified FREE of RNase, DNase, Human DNA - Non-pryogenic