Features: Made of high quality material, high strength, anti-rust, non-deformation, wear-resistant and durable. Hollow out design reduces much weight to lessen the burden of long time cycling, also easy for cleaning. It can promise smooth rotation of chain, suitable for chain ring between 11-42T. Designed for 10 speed mountain bike, easy to install. Nice replacement for bike lovers. Specification: Material: Steel Color: as pictures shown Teeth: 11-42T Applicable: 10 speed bike Weight: Approx. 643g Package List: 1 x Bike Freewheel  

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