Our boiling flasks are made from low-expansion borosilicate glass. Feature uniform wall thickness for superior mechanical strength and shock resistance. Ideal for boiling, heating and mixing in the laboratory. Additional Info: Boiling Flask, Round Bottom, Borosilicate Glass, 250ml, Pk/6 Package Size(L x W x H): 10.6 X 7.1 X 6.3 (IN) Categories: Flasks, Glass HTS Code: 7017.90.5000 UNSPSC: 4.11218e+007 Country Of Origin: INDIA