Features: Capacity: 4 × 2.2mL Max. Speed/RCF: 55,000rpm/275,458 x g K factor: 43.8 Angle: 180° Compatible with: Thermo Scientific™ Sorvall™ MTX 150 Series Micro-Ultracentrifuge, MX Series Floor Model Micro-Ultracentrifuge Recommended for: DNA/RNA isolation, density gradients and small particle pelleting.