Dropouts Bicycle Frame Building Parts: Aluminum Dropouts Material: 6061-T6 Aluminum Surface treatment: Black Anodizing, Silver Anodizing and Raw The Bicycle Aluminum Dropouts in Morong we made are in Aluminum by CNC Machining in tight tolerance and excellent appearance. Some are made by die forging+CNC machining which can help you saving cost if you have proper quantity. If you need the bicycle dropouts in your custom design, please send us your idea to us. We can assist you to develop it in shortest leadtime and lowest price. More photos about our Bicycle Frame Building Parts: Aluminum Dropout: Besides bicycle dropouts, we can also supply full set of titanium bicycle frame building parts, like BB Shell, Seatstay sliding dropout, Dropout Front, Bolt, Dropout Single Speed with Opener/ Hanger, Wright Dropout, Brake Bridge, Single Cable Stop, Adjuster Screw Stop, Derailleur hangers, Head tubes, etc. Any Customized Parts can be available according to your drawings.Dropouts website:http://www.mr-machining.com/bicycle-frame-building-parts/dropouts/