Black LiteSafe 5 mL centrifuge microtube with click-fit cap is made of medical grade polypropylene. LiteSafe microcentrifuge Tube can be stored at temperatures down to -100°C and spun up to 15,000g’s. Click-fit cap provides tight seal to prevent accidental opening during centrifugation. Autoclavable. Unlike amber tinted Tube, these black centrifuge Tube are completely opaque, therefore protecting even the most light sensitive compounds. Argos LiteSafe Tube eliminate the inconvenience of fitting Tube with aluminum foil to protect samples. Ideal for use with fluorescent probes or ethidium bromide. 2 Argos #: T2081.