We provide top caps in two materials (aluminum alloy and carbon fiber). The carbon fiber top cap has a total of six colors, and the carbon fiber is very light. The top cap of the aluminum alloy uses a titanium plating process, which is very amazing in color and prevents rust. Also available with Expender options, compatible with aluminum alloy and carbon fiber top caps ¡¾Carbon Top Cap¡¿ Color:Black Matt/Black shiny/Green/Red/Gold/Blue,6 colors available (3k carbon grid) Material: Toray T800 Carbon fiber Weight: about 6g,approx Thickness: 2.0-2.2mm (strengthen) Suits 28.6mm=1-1/8 in fork steerer tube and headsets Package included: 1PC Carbon Top Cap+1PC M6 Bolt ¡¾Aluminum Top Cap¡¿ Color: Gold/Titanium/Rainbow Material: Aluminum Alloy(Expander&Bowl Cover)+Stainless Steel(Screw) Weight: about 14g Bowl Cover?Thickness: 9mm,approx Bowl Cover Diameter: 32mm Screw Length: 33mm(Gold/Rainbow) ; 30.4mm(Titanium) Suits 28.6mm=1-1/8 in fork steerer tube and headsets Package included: 1PC Aluminum Top Cap+1PC M6 Bolt ¡¾Expender¡¿ Color: Silver Material: Aluminum Alloy Weight: about 34.2g Suits 28.6mm=1-1/8 in fork steerer tube and headsets Package included: 1PC Aluminum Alloy Expender Note: 1.Due to the problem of taking pictures, the Crank Cap may look slightly different in color, please refer to the actual object received. 2.If you have any questions, please feel free to contact us,We will respond to you within 24 hours. thank you£¡