The GKTECH conversion brake lines are to suit S13/180sx that are using Z32/GTST/GTR brakes the braided brake lines are a direct replacement of the factory lines and are stronger (read: more reliable) than the factory rubber lines which are prone to breaking but they also eliminate the spongy feel of the standard brake lines. The front lines are also longer to compensate for big brake setups or cars with more steering lock (which would see stretching with the factory line)
The GKTECH braided brake lines are assembled by us in-house in Australia using stainless steel fittings, stainless steel braided line with a Teflon inner tube and PVC outer for protection. They have passed independent testing and are marked as complying to FMVSS106 standards, ADR approved and are DOT compliant.