Roller bottles, expanded surface, Corning. Surface area: 1700 cm². Easy Grip Cap. Graduations. Expanded Surface Roller Bottles are manufactured from virgin polystyrene, the caps from HDPE. The ribbed design provides twice the surface area with the same exterior dimensions. Sterilized by gamma radiation and certified non pyrogenic, these bottles are treated for optimal cell attachment. One-piece seamless construction with printed graduations. Printed lot numbers to aid in product traceability. Both resins meet the USP Class Vl requirements for plastic containers and closures.