Kevlar reinforced (black) hydraulic tubing: DOT-3/4/5.1 compatible Prime Series kits are for Prime Pro, and Prime Expert brakes only Stroker Ace/Gram/Carbon/Trail and El Camino kit includes specific fittings for lever and caliper (not for Stroker Ryde brakes, use Sole tubing kits) 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