The double button system, which is an industry first, allows you a choice of settings for different conditions. The upper button is perfect for dry or concrete starts while the lower button is suited for tacky conditions. The double system allows you a choice without changing fork guards. As starting line conditions change throughout the day and from track to track, the Fly Racing Double Button has you covered. Very cool design and man, does it work while still maintaining the same cost as the competitor's single button system.Features: Rebuildable design for long lasting performance Aluminum pin and stainless steel spring resist rusting for continued smooth action Fitment Husqvarna TC 50 2017 Husqvarna TC 50 2018 Husqvarna TC 50 2019 Husqvarna TC 50 2020 Husqvarna TC 65 2017 Husqvarna TC 65 2018 Husqvarna TC 65 2019 Husqvarna TC 65 2020 KTM 50 SX 2007 KTM 50 SX 2008 KTM 50 SX 2009 KTM 50 SX 2010 KTM 50 SX 2011 KTM 50 SX 2012 KTM 50 SX 2013 KTM 50 SX 2014 KTM 50 SX 2015 KTM 50 SX 2016 KTM 50 SX 2017 KTM 50 SX 2018 KTM 50 SX 2019 KTM 50 SX 2020 KTM 50 SX Mini 2008 KTM 50 SX Mini 2009 KTM 50 SX Mini 2010 KTM 50 SX Mini 2011 KTM 50 SX Mini 2012 KTM 50 SX Mini 2013 KTM 50 SX Mini 2014 KTM 50 SX Mini 2015 KTM 50 SX Mini 2016 KTM 50 SX Mini 2017 KTM 50 SX Mini 2018 KTM 50 SX Mini 2019 KTM 50 SX Mini 2020