Is this soft plastic good?

[Howe]

http://www.ebay.com.au/itm/100x-2-Soft-Plastic-Fishing-Lures-Single-Curl-Tail-Grub-Worms-Hook-Bait-BREAM-/201292380841?pt=LH_DefaultDomain_15&hash=item2eddf5faa9

I was just wondering are these grubs good for fishing, I fish in river mostly. such as hawkesbury, Narrabeen lake. Is this good with 7g size 2 hook jig heads??.

Thanks.

[Guest]

They are quite small and better off with at least 2 and half inch

[Howe]

They are quite small and better off with at least 2 and half inch

Thank you for your reply. But are the colours good? does all fish target specific colours or every colour works

[Guest]

Colours are ok