By 2025, all brake manufacturers in the United States must eliminate copper from their friction formulations in order to meet the California and Washington Proposition 65 regulations. The legislation was enacted in 2010 due to claims by environmental regulators that as brake pads wear down, copper and other materials are deposited on roadways and in parking lots and then washed into streams and rivers. Too much copper in the water may damage marine and freshwater organisms such as fish and mollusks. On the way to the 2025 rule, the legislation requires brake manufacturers to switch their formulations to low-copper. By 2021, copper content in friction must not exceed 5%. Many friction manufacturers have been forced to start developing new formulations and test a number of different materials to match the characteristics of copper in order to meet the 2021 and 2025 deadline. Fits:- Mercedes-Benz A45 2017, A45 AMG 2018-2014, CLA45 AMG 2019-2014, GL350 2016-2013, GL450 2016-2013, GL500 2015, GL550 2016-2013, GLA45 AMG 2019-2014, GLE43 AMG 2020-2017, GLE63 AMG 2018-2017, GLE63 AMG S 2018-2017, GLE300d 2016, GLE350 2019-2016, GLE350d 2016, GLE400 2017-2016, GLE400 2019, GLE450 AMG 2017-2016, GLE550 2017-2016, GLE550e 2018-2016, GLS63 AMG 2019-2017, GLS350d 2017, GLS450 2019-2017, GLS500 2017, GLS500 2019, GLS550 2019-2017, ML250 2015, ML350 2015-2012, ML400 2015, ML500 2015-2012, ML550 2015-2012, SLC43 AMG 2020-2017, SLK55 AMG 2016-2012, Mitsubishi i-MiEV 2014