These are the Trak Sport snow chains that Tesla sells for $400 at Tesla — Model S Snow Chain - Trak Sport I have used them twice, they worked great, and are easy to put on and take off compared to traditional style chains. They are in very good condition and have been used just twice for a total of approximately 20 miles in Yosemite. PRICE: $250. Includes carrying case as shown below. Reason for selling: later this year I will be trading in my S for an X with 20" wheels and these chains are for 19" wheels only. I would prefer local pick rather than shipping them. If I need to ship them, that cost will be additional, and keep in mind they weigh about 25 lbs (guessing, haven't weight them yet). Thanks for looking.