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PerkinElmer translucent polypropylene tubes are designed to provide you with excellent chemical resistance. PerformRâ„¢ 15mL and 50 mL conical tubes are designed for your routine everyday applications and storage needs. SuperClearâ„¢ tubes are made from a unique medical grade resin that is far more durable than commodity grade resins used in most other brands of tubes. PerformR and SuperClear tubes are available with either a flat cap with a two stage seal, or a plug style cap that includes a very deep sealing area.