Simport® Urinanalysis Specimen Collection Tubes have a conical bottom to facilitate sample removal. Their design offers a skirted free-standing base. These graduated tubes contain a 75 mg tablet of boric acid in order to preserve urine specimens for up to 72 hours without refrigeration. Offered in two popular sizes. Amber color tubes are available for light sensitive specimens. A white leakproof screw cap is supplied on each tube along with a fill line label. Sterile.