technical details: the shaft and head is about 17cm long the girth is about 14-15cm the internal diameter at insertion (where the penis goes in) diameter is about 3cm the ring is about 3.5cm it is all stretchable so don't worry about not fitting it. very comfortable and is 'ribbed' on the inside so you will enjoy it as your partner does too. i love the girth on this. having to suck this is such a turn on. the only thing for me is i wish the base ring would be tighter or somehow more lockable. otherwise this is quite the filler :D