Hash experts, can you help? 9oz Bar.

As a boy smoking hash it was always cut from 9oz (250g) bars (Soap Bar, Rocky etc)

Since joining this site and other sources it seems that the 100g slab is how it leaves the county of manufacture.

Is the 100g slab a new thing? Is the 9oz bar an old thing?

There are also stories of a lot of contaminants in soap bar. Was this added in county of manufacture? Has the hash always left the producing country in 100g bars then been mixed with contaminants and then re pressed?

How do you vendors receive your hash? 100g 200g 250g slabs?

Interested to know more!

Thanks