Our Glass Shell Vials have straight sided walls for maximum labeling space. Our shell vials are made from sturdy, chemical and thermal resistant type I borosilicate glass. Seamless, tubular, glass shell vials are often used for sample analysis for chemicals, specimens, and other materials. Shell vials play a particularly integral role in viral cultures. All standard shell vials are for use with corks. The 1 dram and 4 dram shell vials can use plastic stoppers as well.