these are the extreme duty springs from rubicon express. the springs are a great product, however, you must be prepared for them to sag a bit. for my application this was a non issue, and preferred.
with the wheeling i subject my jeep to, i did have one spring failure, and RE would not honor any warranty of any sort. Their customer service is the bottom of the barrel, but their products are almost worth their lack of service.
Price: $380.00 Pros: Ride very smoothly. They do really well off road as well. Cons: Rust slightly after about a year, i do live in cleveland though so thats expected with all the snow. Recommended? Yes