Is this safe for guinea pigs?

[Piggie.doodles]

Hi So I bought this willow fencing to make a little play pen for the guinea pigs but I bought a few too many and I was wondering if I pulled the willow sticks out, would they be ok as guinea pig chew toys? I’m just worried that they may have been treated with something?

 

[Swissgreys]

If they don't clearly state untreated on the packing I wouldn't feed them to be honest.
You can buy small bundles of willow sticks from most pet shops, but personally my piggies have never shown much interest.
Fresh willow twigs on the other hand are a whole lot more exciting!