It is obvoius from the large cut out that this is a Selle Italia SLR Superflow saddle. Selle Italia offers two of this model, the 130 and the 145. These number represent the width of the rear of the saddle. This model is the former and smaller version, the 130. The cutout it self is approximately 160mm long and 35mm wide for those seeking maximum pressure relief in sensitive areas. This version is 130mm wide for extra sit bone support and despite its wider width, it is only 191 grams actual weight.
Selle Italia keeps the weight down with a carbon fiber impregnated shell and slim but effective EVA padding for some cushioning. Round, 7mm titanium rails give strength and allow this saddle to installed on virtually any seatpost.