Automotive grade glass which is High Definition and safe. Adjustable to different viewing angles with ball and joint design. Fits 21mm to 26m handles bars by using spacers for the perfect fit. Made of engineered plastic & aluminum. 5mm allen wrench needed for assemblyCompatible with Discover 3, Discover M, T1 ST Plus, Triker, Fold 1 Plus, Breeze 1, Tempo, Nomad 2, Nomad 2X, GoMad, Summit 1 and Summit 2.