This is a more general question about "normal" foreskin rings.. Are they normally the same type of the skin as the surrounding foreskin or is normall a tight band that just happens to be big enough for most men. ie, is the band tight for everyone? or is there is specific difference in skin around this area for people with tight foreskins?

not sure if that was a clear question..

That's actually a good question. All start the same. The difference occurs with how it is handled and exposed over the development years. There is a little muscle which surrounds the opening and helps to form the tapering end when the foreskin is forward. In the toddler years, it keeps the preputial cavity safe from bacterial invasion. As the boy matures, if the foreskin is exercised, the muscle will allow retraction but still keep the taper as the skin is moved forward.
At maturity, this same muscle keeps the foreskin tight as it moves back and forth over the corona of the glans during sexual activity, thus providing additional depths of sensations.

The key difference is in the exercise and/or exposure to infections which prevent the skin from flexing sufficiently.

I would say there are two things about the foreskin. Firstly, it is simply - skin - not grossly different from other places but generally, quite elastic. {Like all skin, this elasticity tends to be lost with age, so elderly men do lose that degree of flexibility.}

Secondly, it is in a unique situation of spending most of the time under virtually no tension. As such, it has little provocation to grow except for that proportion of the time when it is put "on the stretch" - specifically by erections.

Now you may or may not realise that the vast majority of erections occur during sleep - you may spend an aggregate of an hour, perhaps two or more, erect whilst asleep each and presumably every night - but not in one contiguous session.

The foreskin can "interpret" this strain either by elongating, or by stretching open. The "normal" thing is that the glans pushes its way through the foreskin as a sort of "wedge"; how effectively this happens probably varies with posture so that the foreskin may on some occasions retract fully, but on others, remain covering the glans during erection. If it instead elongates, this may then always happen and it may not be stretched open.

And of course, there is the matter of behaviour - frequent playing with the foreskin will tend to lead to retraction and once retraction is discovered, it should become an enjoyable pursuit.

There are of course the contrary possibilities of irritation and subsequent infection, thence scarring due to the use of irritants such as soap and particularly "bubble bath" (essentially, re-badged dish-washing detergent), and deliberate abuse such as has been advised by some doctors in the matter of forcibly retracting the foreskin to purportedly "clean" (which actually introduces bacteria) in infants or indeed older children.