A: All natural untreated Redwood. The Prop 65 sticker is just warning you of sawdust since California classifies it as a hazardous chemical.
A: It's not pressure treated, but, it is treated. In california it has a warning label, its some kind of all purpose fungicide/insecticide.. it keeps the wood pretty on the store shelves. But, its not strong enough for long term protection like PT..