Knuckle bones - from what age?

[AlwaysLookOnBrightsideOfLife]

Friend bought a pack of two knuckle bones from Pets at Home which state "not suitable for puppies under 4 months". Does this mean they can be given to puppies from 5 months onwards?

There seems to be a lot of conflicting advice on Google (raw bones from 10 weeks, other places stating 10 months etc.).

Does anyone know?

Are they raw (frozen) bones or roasted ones?

Sorry I should have said, they're roasted ones.

Cooked bones of all kinds are a no no, even the ones sold in pet shops.

Raw bones (as long as they're appropriately sized) are fine for puppies, some breeders even wean straight onto raw. I gather people tend to avoid large weight bearing bones though as even raw they can be pretty hard on the teeth.