Globe Scientific is pleased to expand on this line of premium quality micro centrifuge tubes with attached snap caps. The polypropylene (PP) tubes are resistant to most chemical reagents and can be autoclaved at 121°C. Each tube is molded with precise graduation marks for accurate measurements. These micro centrifuge tubes are offered in resealable, tamper evident self-standing bags. The ultra-clear polypropylene of the natural colored tubes won't hinder spectrophotometer reading.