Nack identifies the saddle rail range produced with a monocoque carbon structure. Prologo R&D has engineered the seat post clamping area by a specific nano carbon fiber technology named BRC in order to support the maximum stress under the seat post clamp tightening. BCR is the acronym of Braided Carbon Rail. Specifically Carbon layers are matched to a specific composition of carbon fiber, kevlar and aluminum-alloy filaments. The Nack rail is a structure which grants the maximum stiffness to the ride and at the same time an extraordinary lightness.

Tirox Rail is produced by light-alloy steel. Tirox grants to saddle rails top resistance and stiffness applied during pedaling forces. The specific steel is derived by aerospace and aeronautic industries. Tirox is the well-balanced rail, best compromise among weight and rigidity.

Rail in chromoly with an hardness ratio of HRC 39 with a tickness wall of + / -2 mm, T2.O represents the high compromise between mechanical features and high torsion ratio.