What's the size on quotes for BRK.A and BRK.B?

[ericholtman]

If the quote size is 4x2.....

for BRK.A is that 4 shares by 2 shares, 40 shares by 20 shares, or 400 shares by 200?

same question for the B class.....

 

[KrispyKreme50]

It literally means 2 x 4 shares but I thought that the bid/ask size is usually 100 x 100 on BRK.A?