Description:This is Xpress Composite Ball Bearing Tension Adjustment Hub, genuine official replacement part from Xpress.Feature:For: Xpress Execute XQ1 XQ10 XQ10F XQ1S XQ2S XM1 XM1S FT1 FT1S FM1S DR1SMaterial: PlasticColor: BlackInclude:Composite Ball Bearing Tension Adjustment Hub (4 pcs)