Bathmate Hercules Crystal Clear. The Hercules is a sensational Bathmate that enlarges the penis, increases the strength of his erection as well as improving penis health. This penis enlargement pump does so much more than enhance his size and is a great all-rounder when it comes to general penis health. The Hercules in clear allows you to see the action as it happens. It is made from medical grade silicone that is phthalate free. This penis pump is safe to use on skin and makes the ideal pick for beginners. This hydropump should be a regular part of his care routine, and an increase in size through regular use is guaranteed.