usually hay is for guinea pig or rabbit...not advisable to use hay as bedding for hamster coz if its sharp & when the hamster carry it around in his pouch there might be chance of him poking his pouch.

the reason why we dont get ceder or pine is because they are very toxic to hamsters. they produce toxic that is bad for the hamster respiratory system & will react with the hamster pee which is very acidic. the way they are processed is also bad...they undergo so many types of chemical process...anyway the best is aspen but the problem is its very very hard to find over here. plus it will be quite expensive too.

i think the 1 u saw is chipsi bedding that has apple scent  frankly speaking chispi isnt the best bedding too but its quite affordable for people like me (student). chipsi bedding is made from softwood which is from fir & spruce they do produce oils & there is smell from it too (but its way way better than using pine bedding) which isnt that good for hamster respiratory. but its said to be safe for hamster & its quite soft too. i been using that bedding & so far its ok for my hamster. same goes for delikate brand too as they are made from softwood too. but the good thing about delikate is they do not have strong smell compare to chipsi which i assume is good for hamster. any scented bedding is bad for hamster respiratory. if u want to buy bedding get natural scent, avoid those apple scent, lime, lemon etc... 

& of course the best brand will be breeder's celect or healthy pet. corn cob type of bedding is also very good but its hard to find & quite expensive. but if u can afford it then why not...its good to give your hamster the best stuff u can provide. oh btw shredded paper is also good for hamster as bedding but its too expensive. (u cant use newspaper as they have ink on it & it might be harmful for your hamster).

Did u change the bedding suddenly? Or did u use quite long time?
Maybe its irritation and the hamster bite the fur.
How old are they? It may be old age.
If its mites , it can attack both ww , but it depends.

My hamster don't really like the bedding i gave them. They will just sweep it away. The bedding i gave them is the wood shaving. Don't really know the name because it is written in Japanese.

will ur robo let u catch??....i have 2 robo....but they dun let me catch them..will run away when i wan touch them

@ elfreakz
I think it's normal my robo too very particular with his foods.. he will keep his food bowl as clean as he can unless after he was in the bathing sand & straight away went to eat den the food bowl will have some sand. Ohh.. u can shred some tissue for your robo to play with.. My robo love tissue very much.. Everytime when i shred some for him.. He will bite it & run around playing with it.. & sometime will just make a circle to become his nest & sleep.

Maybe its old age.

Dont worry , my ww love to dig too and their food bowl is always in bedding.