Product details: Brand: ROCKBROS Material: carbon fiber + microfiber leather Weight: approx. 136 g (103 MM) / approx. 150 g (152 MM) Color: black Size: approx. 275 * 127 MM (103 MM) / approx. 247 * 150 MM (152 MM) Features: Ergonomic design: Ergonomic design makes cycling more comfortable to reduce nerve compression. Breathable: The hollow design in the middle of our bicycle seat not only reduces the weight, but also makes it more breathable. Material: The padded seat arch and the base of the saddle are made of carbon fiber, which reduces the riding load and does not deform easily. And the bicycle saddle is made of microfiber leather, which is tensile and wear-resistant. Two sizes available: There are 103mm and 152mm width bike seats to choose from, you can choose the cushion that suits your needs. Shock absorption and comfort: The saddle's spring arch technology not only provides strong support, but also has a shock absorption effect, which is more comfortable. Suitable: Suitable for mountain bike/road bike/city bike, etc. Please note that the rail dimensions are 7*9mm. Make sure your bike saddle is compatible with these dimensions. In addition, it is recommended to use a torque wrench for assembly and tighten to the torque indicated on the bike saddle.