I wanted to compare with the 6263M model which is a little more basic and lighter which his party is facilale elastomer (but is strangely more expensive ... go figure), and 7523M is more flexible at the port face. I also have the impression that encompasses a little more face but I think it is mainly due to the fact that the material is soft silicone (and actually more comfortable to wear).
The cartridges are not too bulky when turning the head which is a good thing. Not test the size "small" or "large" to get an idea ...
