Getting lots of questions about the differences between these two saddles. The leather is the same, it's the frame that is different.
X1 - Frame constructed of 4130 Chromoly Steel. Saddle weight = 500gms.
X2 - Frame constructed of Aluminum, rails of tubular stainless steel. Stronger rail geometry. Modular in design, so replacement parts can be sent to the rider for self installation. Saddle weight = 420gms.