This article can help. These include the disease of whatever reason that dilate the blood vessels of the penis and back to regular exercise sets a normalization. This item is not toys, but serves a medical purpose, so that the limb of the man stiffened again, this additional information from the manufacturer. If an impending erectile dysfunction (impotence) pending, I recommend a urologist confidence seek. Next would be in the event of a dysfunction impotence drugs such as Viagra, Levitra or Cialis recommended (private prescription). Training with the cylinder should be approached cautiously, as can skin discoloration caused by the congestion. Each user will probably have to make his own experience. Further, it may result in a growth of the limb. My recommendation would be that should not be excessively large, the inner diameter of the cylinder. The cylinder should have an inner diameter of max. 8 mm not have more than one's own anatomy, as well as the length of the cylinder should be at least. Be 2-4 cm longer than the term since, the cylinder in the area of skin pressed by the vacuum of the piston pump into and progressive training, the bands the limb stretch. Different sizes of the cylinder one will be able to locate. M. f. G.