Features110 Speed for Mountain Bikes: 10 speed has always been a requirement for mountain bikes, and single sprocket has become the trend of lightweight and wide gear ratio. 2Switch to 10 Speeds Bike: To match the value of DIY bikes, most of the bikes you buy from other brands are 7, 8 or 9 speeds, these allow you to change/upgrade them to 10 speeds in one package. 3A7 Gear Lever: Speed is 1x10, adopting 1:1 technology, precise and quick response, made of sturdy luminum gear lever, transmission line with ultra low friction coating technology. 4A7 Rear Derailleur: Speed: 1x10, enhanced damping technology to effectively reduce chain jitter, for giant sprocket 50T, shadow RD bevel design, large bearing pulley. 5Package List: 1 x shifter, 1 x 42T flywheel, 3 x flywheel accessories, 1 x 36T disc, 1 x 10 speed chain, 2 x chain link head, 1 x tail hook, 1 x screw, 1 x accessories.SpecificationA7 Shift Lever:Speed: 1x10Feature: 1:1 Technology, Precise and Quick ResponseMaterial: Aluminum Shift LeverShift Cable with Ultra Low Friction Coating TechnologyA7 Rear Derailleur:Speed:1x10Feature: Enhanced Damping Technology to Effectively Reduce Chain JitterShadow RD with Slant DesignLarge Bearing PulleyCassette:Tooth: 11-42TChain Guide GrooveFeature: Lightweight and DurableMaterial: Aluminum Alloy Bracket42T: 11-13-15-18-21-24-28-32-36-42TChainringTooth: 36TBCD104Color: Black (Default)Material: Aluminum Alloy 7075HV: 15+Chain:Speed: 10 SpeedSection: 116LColor: SilverPackage List1 xShifter1 x 42T Flywheel3 x Flywheel Accessories1 x 36T Disc1 x 10 Speed Chain2 x Chain Link Head1 x Tail Hook1 x Screw1 x Accessories