Description: Add a little colour to your bike with an aluminium lock ring. It comes in a choice of four colours so you will be able to find something to match your bike. Our machine it for a precise fit and to make sure it is very light. Of course it also holds on the cassette, no matter how powerful a rider you may be. Features: Made of aluminum alloy material, Low density, erosion proof, electrical conductivity, good thermal conductivity . It's compact and simple to use, no need to remove your chain. Our machine it for a precise fit and to make sure it is very light. Add a little colour to your bike with an aluminium lock ring. It comes in a choice of four colours so you will be able to find something to match your bike. Specification: Color: Red / Golden / Blue / Black (Optional) Function: Fixed cassette flywheel Package Included: 1 x Bicycle Flywheel Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures. .