The Low Frequency Spring Sets allow for a more plush suspension feel with increased grip and more stability. The five included springs are only separated by .05 lbs/in increments allowing for very fine tuning to get your 22 vehicle dialed in. The lower frequency springs also land better allowing for a mellow rebound as the car settles quicker and more consistently.
TLR233013 Rear Spring Set, Low Frequency (5 pair): 22/T/SCT
Selling Price: $23.74
TLR233012 Front Spring Set, Low Frequency (4 pair): 22
Selling Price: $19.99
TLR232002 Solid Drive Pin Set(8): 22/T/SCT
Selling Price: $3.99
[source: www.tlracing.com]