Cylinders comply with ASTM E-1272, Class A standards, batch certified. With hollow glass stopper. Double metric scale, calibrated to contain. Borosilicate glass cylinders with pour spouts feature heavy uniform wall tubing and strong, stable, hexagonal bases. All cylinders come with bumper guards. Additional Info: Graduated Cylinders, Glass A, Batch Certified, With Stopper 1000ml Package Size(L x W x H): 19 X 7 X 6 (IN) Categories: Cylinders, Glass HTS Code: 7017.90.5000 UNSPSC: 4.11218e+007 Country Of Origin: INDIA