8" x 2" / 20.25cm x 5cm"Pump up your training routine!" ?American Pumpers AssociationDurable cylinder with universal measurementsSilicone sleeve adds superior suction seal and ribbed textures for added sensationsEasy squeeze bulb with quick air release valveBody safe Silicone enhancer ring includedSilicone (ring, sleeve) SAN (cylinder) Phthalate-Free PVC (hose) ABS (release valve) Rubber (bulb)