Corning Expanded Surface Roller Bottles are manufactured from virgin polystyrene, are treated for optimal cell attachment and are certified non-pyrogenic. The ribbed design provides twice the growth surface with the same exterior dimensions as a standard 850cm2 roller bottle. Two window areas provide microscopic viewing as well as pouring surfaces. Bottles are treated for optimal cell attachment, certified non-pyrogenic and have individually printed lot numbers to aid in product traceability. Vent caps are available for applications requiring continuous gas exchange. Packaging: 20/cs