Size and shape: 18" Round Inflated diameter in inches (centimeters): 14 x 14 (34 x 34) Gas capacity in cubic feet (cubic meters): 0.5 (0.014) Average # per 242 cu. ft. tank: 494.0 BDAY ELEGANT DAMASKSKU: 0071444309776€12.00PriceSales Tax IncludedHeliumFilledMaterialFoilSize18"QuantityAdd to Cart