Kevlar reinforced (black) hydraulic tubing: DOT-3/4/5.1 compatible. El Camino and Stroker Carbon/Trail kit includes specific fittings for lever and caliper. HFX-Mag/G2 kit includes a pre-crimped inline caliper fitting and specific HFX-Mag lever attachment (can be used with older G1 caliper if angle warrants fit) . HFX-9 kit includes a pre-crimped inline caliper fitting with specific HFX-9 lever attachment. Sole and Stroker Ryde kit includes specific fittings for lever and caliper. Tubing parts that fit HFX-Mag also fit Original, DH, FR, and Comp systems.