Some type of red sex link. Different hatcheries market them under different names--red star, cinnamon queen, etc. They're usually pretty docile and bred to be great layers. Some folks feel they have increased risk of laying issues due to their higher rate of production but the only problem I've had was softer shells, easily remedied by oyster shell.
I have 4 hens that look exactly like yours, they are big girls! I got two from tractor supply and I rescued two from the local animal shelter. I love them