OZB vs ZB1

A

affan

I am using IB and was looking to sell OTM 150 put for /ZB in Dec. IB is giving me 3 options:
OZB DEC 16
ZB1 DEC 02
ZB2 DEC 09

OZB is quoted as 11/64 - 15/64
ZB1 is quoted as 50/64 - 1 3/64
ZB2 is quoted as 1 9/64 - 1 27/64

I understand ZB1 & ZB2 are weeklies and their relative price difference. What I don't understand is why OZB is quoted so differently? Would appreciate any help.
 
It's actually the weeklies which are different. The OZB is the normal one. What exactly are you wondering about? The naming convention or why the price is so different?
 
I was wondering why the price is so different. Unless the OZB expires this month? I was thinking it expires in December.
 
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