1. materials: low borosilicate/neutral borosilicate/ high borosilicate glass , match your diffirent using 2.welcome OEM/ODM 1. Test tube with round bottom and flat bottom 2. Test tube with rim and without rim3. Regular size,12*55,12*60, 12*100, 15*100, 16*150, 18*150, 18*200, 20*150, 20*200, 25*100, 25*150, 25*200, etc.we also manfaucture customized size.4. mouth: plain/ rim/ srew mouthCURRENT ...