CNC machined 6061 aluminum.Black anodized finish.Attaches to frame with (1) M8 Chainring Bolt.Fastener not included.CompatibilityDevinciCactus - 2006Chili Pepper - 2003Desperado SL 3/2/1 - 2007Devinci - 2007, 2012Helsinki - 2012Leo - 2012Leo SL - 2013Leo...