From the manufacturer:
Steel is back with this competition frame made with Columbus Spirit super oversize triple-butted tubes. Entirely made in Italy. A classic look with modern details, from the head tube to the monocoque carbon fork and molded chain stays to contrast transmission force. The Tig welding technique allows for a myriad of custom geometries and increases the frame stiffness.
The 1.5" tapered head tube with the Columbus monocoque FEL fork increases the reactivity of the frame and the handling of the bike. The lug with the integrated Nemo seat clamp permits the best connection between the seat stays and the horizontal tube, offering an ideal weld surface and avoiding any stress concentration.