The FSA DH Pro MTB chainring is a single-speed oriented chainring for 1x DH applications. Can be used with chainguides and bashguards Precision CNC machined AL7075/T6 alloy No shift ramps- for single chainring use only 3mm thickness Tooth Count: 40 Ring Position/Type: Single Drivetrain Speeds: 9 , 10 Chainring BCD: 104 Material: Aluminum