The birds are a smaller breed, but larger than a bantam. The most coveted feather color is called "blue", which is in reality a shade of slate-gray. Our birds are Blue and Splash (white with large gray specks). They love to free-range and are quiet birds, although sometimes a bit skittish. The hens lay a beautiful green egg, and on my farm, are very broody. They seem to have a special bond with their chicks, too. I've often found their offspring nesting right along with the mother even after maturity.
Our Isbar flock is small right now, but that won't be the case for long if the broody mothers keep on hatching chicks. We'd like to eventually make some fertile eggs available to other rare-breed chicken lovers, too. That's further down the road for us, but right now we simply enjoy having this very rare breed roaming around the barnyard.