Each specific adapter is custom-made for the corresponding motorcycle model to ensure the best fit. These adapters are made of stainless steel. A kit contains 2 pieces. These adapters are made of stainless steel. Please note, if purchasing the Rizoma license plate holder, it may not be necessary to also purchase the mounting kit for Rizoma rear indicators. In most cases, the latter are already included in the license plate holder kits. Therefore, it is always recommended to check the technical information of the Rizoma license plate holder to ensure it includes the supports for Rizoma rear indicators.