What´s the diff.: 7mm, 50mm, and so on

Hello all you wonderfull ladies.

If was reading old post, and found this, written by Sara from PlasticHaar:
[.....]now about the curls:

at order (big order)
ANY sizes of curls are avaible..
3mm, 5mm 7mm 55mm 43mm whatever you want!
for me 50mm and 28mm are the best to keep in stock,
50mm is more wavy thats why i call it wave,
its like the dome or prostyle, it has a natural kind of wave.
the 28mm is more curly but still very natural.

so if you want anything else then 500mm/28mm
i can order that for you!
min. order quant. is 5 pce each style and colour
and you'll have to wait a couple of weeks.
i always have pending orders in asia but it takes time to shipp
the stuff : ))

So what is the difference?

/Synne

Here we go. No styling, just airdryed

First time around i would like these colours in a curly version, but same lenght (pic found on PlastikHaar website):

Thank you for your advise