This anal dilator set is really perfect for someone engaged in anal training. If just starting out with this sort of anal training, the smaller three sizes are perfect. Over a period of time the wearer will be stretched open enough to accept insertion without large amounts of lube. The larger two anal dilators will open the asshole quite wide. For fisting, this might be a nice first step. The two large dilators will also tend to induce a nice gape for those that value that sort of anal training. You might have noticed our set is transparent. This was no small endeavor on our part, but we felt the effort has been worth it. The added benefit of being able to really see up into someone while they were anal stretching was something we felt should be given a high priority. With lube, these anal dilators become as clear as glass. The five dilators in this set range from size small which is 3.5 inches ling, 1 inch diameter to 5.25 inches long 2 inches diameter. Made of rigid urethane plastic that becomes fully transparent with lube.