What cassette is this?

[LTS Biker]

clean it with dishwashing liquid stuff and you'll see markings on the spider with the teeth towards you.
It will say: CS-M737 of CS-M900 and it should be 8 rings.

 

[BoyBurning]

kc and the sunshine band - 'give it up' ?

You piss me up sometimes!!

 

[legrandefromage]

kc and the sunshine band - 'give it up' ?

You piss me up sometimes!!

Its my job. Sometimes this place is lacking in a sense of humour, all those fat unfit middle aged blokes sweating over bits of metal cannot be taken seriously.


Anyway, I think you have a cog missing:

 

[FluffyChicken]

It's missing the 12tooth (7th) sprocket.
as you have an 11-28 CS-M737 cassette there.

 

[orange71]

think you're right

 

[FluffyChicken]

It could well have been used as a 7 speed cassette though.