These disposable PYREX® glass round bottom test tubes are packaged for your convenience in easy-to-open, easy-to-use bulk packs. They are made of borosilicate glass to reduce pH changes and contaminants potentially leached from soda-lime glass.

• Round Test Tube Rack Hold 24 Tubes up to 20mm
• SEOH TEST TUBE RACK PLASTIC For 40 tubes
• B000TVOKIS
• B005XYWGK0
• SEOH 25 Pack Glass Test Tubes 4-inch 13x100mm