Comfortable and convenient to use as it is accompanied with a manual guide and DVD guide to help you every step of the way. Has a cumulative effect - the more you use it, the better the results and the more full erection health is restored in the body. The vacuum flask itself is made from high impact polycarbonate with an Elastomer skin safe bellows pump. Is one of the most powerful vacuum devices available. Supported by top medical practitioners and is used widely and prescribed in the NHS. * Please note - before you purchase this product, you are fully aware that it is for, predominantly water-based use and although can be used in air is not as effective * Please be aware that this item has to be ordered in and can take up to 5 days to reach us.