13 x 100mm Borosilicate (heat resistant) glass test tube, tube has rounded bottom, rolled-top lip. Size is given with  OD (Outside Diameter) first then length. All measurements are approximate. OD measurement may vary by up to 1mm.
Pack  of 12.   These test tubes do have the size printed on them. These are heavier than the test tubes without writing. Cork stopper #2, Rubber stopper #000 will fit this tube. (Cork & Stopper Sold Separately)