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Designed for oil-free operation, tube is made of transparent, superior quality grade polypropylene for better viewing of the contents. Their ultra thin wall design will ensure rapid thermal transfer and a significant reduction in cycle and PCR reaction time. Ideal tubes design when centrifugation is necessary. Attached hinged caps dome can be used with heated lids used by thermal cycler manufacturers. They provide positive sealing during thermal cycling and will prevent evaporation while being easily opened and closed with one hand. Tubes have a frosted writing surface for sample identification. Tubes come in a choice of four non-cytotoxic, non-metallic colors or colorless, packaged in tamper-proof, re-sealable, safety-lock bags. Autoclavable.