Material: Environment ABS plastic, diamond spring and Environment Sponge100% Brand New and high qualityDimension: 13 * 9.5 cm like to show pictures. (due to manual measurement, please understand, may be 1-2 cm error)Gender: UnisexSuitable for: elderly, office crowd and sports enthusiasts and so on.Feature: Does not occupy small size space, Health is theSimple and practical sports actionUnique design firm and durablePadded Foam Handles for Comfortable Grip.