These chicks will be 1-5 weeks old and will still need access to some sort of heat source to warm up until they are fully feathered.
Barred Plymouth Rocks or "Barred Rocks," as they're called, are one of the most popular dual-purpose chickens on small farms today. Their heritage is unclear with reports of different crosses, but what is clear is that they're very friendly, great layers of large brown eggs and able to withstand cold weather quite nicely. These are also widely used as one of the foundation breeds in some Sexlink varieties.
Barred Rocks mature moderately quickly at about 24 weeks and will lay 275 - 300 eggs per year.