Trail Riding/Packed Snow (for SLT Ski only) Best trail runner combination is the use of SL4-127 Carbide Runner in conjunction with the SLB-121 Keel Blade. This combination, along with the SLT Ski design, achieves the maximum reduction of tracking and darting, with minimal arm effort. Trail Carbide 4 x 75°, 1/2 “host bar