Features: Six Primary Springs (black/short) Six Secondary Springs (silver/long) Color coded stripes to identify rates Spring rate chart available showing all possible combination's and effective primary/secondary rates. What’s included: Primary Springs: Super Soft 3.7 lb in (2) Medium 7.3 lb in (2) Firm 9.5 lb in (2) Secondary Springs: Super Soft 3.5 lb in (2) Soft 3.6 lb in (2) Firm 6.2 lb in (2)