Kimble 294000-0025 Heavy Wall Round Bottom Flasks, Single 14/20 Standard Taper Neck, Borosilicate Glass, 25 ml: Amazon.com: Industrial & Scientific
StonyLab Glass 100 ml Long Neck Round Bottom Flask, Borosilicate Glass Heavy Wall Round Bottom Boiling Flask RBF with Long Neck, 100ml : Amazon.co.uk: Business, Industry & Science