VENTUM NS1 Premium Headset KitIncludes:A-HST-03-057-0050-303VENTUM NS1 Compression Plug 50 mmA-HST-03-054-0000-303VENTUM NS1 Headset Integrated Sealed Bearings 1-1/8"x 1-1/8" SteelA-HST-03-055-0000-001VENTUM NS1 Headset Bearing Fitting BlackA-HST-01-081-0000-001VENTUM Headset Allen screw rubber cover BlackA-HST-03-058-0000-001VENTUM NS1 Flat Top cap BlackA-HST-03-051-0005-001VENTUM NS1 5mm Left Spacer BlackA-HST-03-052-0005-001VENTUM NS1 5mm Right Spacer BlackA-HST-03-052-0010-001VENTUM NS1 10mm Right Spacer BlackA-HST-03-051-0010-001VENTUM NS1 10mm Left Spacer BlackA-HST-03-057-0214-001VENTUM NS1 Di2 Front Derraileur FerruleA-HST-03-057-0216-001VENTUM NS1 Rear Hydro Exit FerruleA-HST-03-057-0217-001VENTUM NS1 Di2 Rear Derraileur FerruleA-HST-03-053-0000-001VENTUM NS1 Di2 Compression Ring BlackA-HST-03-203-0000-001VENTUM NS1 Di2 Top Cover Black