Student grade borosilicate (heat resistant) glass test tubes with no writing, measuring 13mm x 100mm.  Size is given with  OD (Outside Diameter) first then length. All measurements are approximate. OD measurement may vary by up to 1mm. (4)/case of 100. Great for schools and all kinds of craft ideas.

A size #00 rubber stopper or size #3 cork stopper will fit this test tube.