16x150mm Glass Test Tube， Screw Top， With Cap， Black (Pack 10) Karter Scientific 402G2</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Test Tubes made of 3.3 borosilicate glass， with plastic screw cap</li><li>Feature cylindrical bottom</li><li>Use of 3.3 borosilicate glass as material helps to reduce pH changes and contaminations potentially leached from soda-lime glass</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41lNojulL9L.jpg' noproxy></br>