Cock ring helps flaccid gains

I heard wearing a cock ring after PE workout can increase the size of the flaccid hang, can someone elaborate on this.

how long should it be worn and the kind and size to purchase.

This time I will encourage you to use the search feature. There have been many threads on this subject, so it has already been elaborated on.

Use these words for the search: cock AND ring AND flaccid

I will point you to one thread which has helped many:

ENHANCE YOUR PUMPED/UNPUMPED BULGE - THE VELCRO WRAP