For those that are looking for an all rubber inflatable gag, this is it This penis gag has a.5 inch hole that feeds through a 9 inch long hollow rubber tube. This allows for easier breathing or for some great breath play by opening or closing the hole. Fluids can also pass through the rubber tube and into mouth making the gag a whole lot of fun Gag secures by means of a rubber buckle strap and inflates by means of a rubber hand pump. A valve on hand pump controls the amount of air flow into the gag.