Silver
I have found Dari cobs come with Flax/pods (Linseed( and panicle millet (I asked Rosewood especially)...meant for parrots though....called "Pick and Fly". I get it online from Amazon and ebay but I think it is available from a variety of online pet stores.
The Flax pods are particularly popular....shredded in seconds!
With regard to the wheat it does indicate that more than one stalk of wheat can be given each week, I think the dates are very good too so 50 would be possible to get through before they go out of date, and they are not huge stalks.
I will see if I still have the pack of "bouquet" I got mine in to see what use by/best before date they gave (I decanted into a lock and lock to keep fresh)..