Stance race springs are made from the highest quality to insure consistent rates. Its constructed of silicon chromoly metal. All Stance springs are cold wound to prevent sagging. All spring have an ID of 2.5 MSRP: 4k - 9k $80 (per pair) 10k - 12k $90 (per pair) 13k - 16k $100 (per pair) CONVERSION: 4kg 250mm or 225lb 10in 5kg 200mm or 282lb 8in 6kg 125mm, 150mm, 200mm, 250mm or 339lb 5in, 6in, 8in, 10in 7kg 175mm, 200mm or 395lb 7in, 8in 8kg 150mm, 175mm, 200mm or 452lb 6in, 7in, 8in 9kg 175mm, 200mm or 508lb 7in, 8in 10kg 200mm or 564lb 8in 11kg 150mm, 200mm or 622lb 6in, 8in 12kg 150mm, 175mm, 200mm or 678lb 6in, 7in, 8in 13kg 200mm or 735lb 8in 14kg 200mm or 791lb 8in 15kg 200mm or 846lb 8in 16kg 200mm or 904lb 8in