Helpful topic info on Dildo Sizes:

maximum size!
I've been gone for a while, but I return with news! My maximum diameter i could take was 3. I have just moved up to 3.25 with The Cyclops. Anyone else

Dildo Size Preference
What size dildo do you use in relation to your current lover's penis size? In the comments below tell us whether your current lover is average,...

Has your dildo size preerence changed?
I have a question for those who have been using them for a while. Do you find that over time you like the bigger/thicker ones as you get used to...

A little size help, please?
I'm kind of ocd and whenever i do any kind of research I ask a lot of questions about the product before I actually invest in it. I'm looking to get..

Ladies- what size dildo do you prefer in relation to pre and post pregnancy??
I've wondered sometimes while writing my reviews how much having been pregnant and/or having a vaginal birth affects what type of dildos women prefer.

Perhaps it is a difference in the materials? They might set differently and swell or shrink when they do.

Good question. Ive been looking at both of these for sometime. Ideally I want the 7.5 on the UR3 material. But I gueeeeesss i could fit the 8in in there. Its a lotta money to not have the exact size before ordering. Anyone have any insight on these 2 dildo circumferences?

Seems weird the size would be different. The mold should be the same, just the difference in shrinkage or expansion of the material after the injection molding.