FSAs flagship headsets in separate upper and lower headset cup assemblies FSA Integrated 41.2mm ID (36x45), Campy Hiddenset 42.0mm ID (45x45) , ZS (ZeroStack), or EC (traditional External Cup) available for 1-1/8 inch and tapered steerers For clarification
        
| model | Premium Orbit IS | 
| upper/lower | upper | 
| S.H.I.S. | IS41.2/28.6 | 
| stack | 8.2mm | 
| color | black | 
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