Novas Bio Clear Snaplock Microcentrifuge Tubes: medical-grade PP, frosted write-on surface, 14,000–20,000 RCF, RNase/DNase/endotoxin-free (LAL), BSE/TSE-free, autoclavable. Three sizes: MCT-060-C (0.6 mL), MCT-150-C (1.5 mL), MCT-200-C (2.0 mL).