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These are 21" Arachnid silver wheels and tires, brand new as I just got them from Tesla (they are a referral prize and just came in). My understanding is that the wheels are shipped to the service center who mount and balance the tires.
These are staggered wheels/tires.
2 of the tires are 245/35/ZR21 (go on the rear)
2 of the tires are 265/35/ZR21 (go on the front)
The wheels each have a silver Tesla "T" wheel cap installed
The wheels are supposed to have TMPS sensors installed that work with my car (A March 2017 Model S, I am told that is a Generation 2 TPMS). I do not know how to verify this as the tires are mounted on the wheels, but everyone else who has received the referrals says they are Gen 2 TPMS units and I have no reason to believe these are any different.