Big Mounting Plate made from polypropylene, reinforced with 30% glass fiber. Designed in Barcelona to ensure a sleek and premium look on even the most modern bikes. Engineered to create a lightweight and durable base for your top case, reducing weight (almost 10% less) and adding strengthen through structural reinforcements such as recessed features and a honeycomb backside. Thus, allowing worry free travel even on those most daring adventures.