- 6061 T-6 aluminium internally relieved cups and cover to reduce weight - – High Quality, Low friction face seals on the crown races – Dependable black oxide, sealed bearings – S. H. I. S: upper EC34 S. H. I. S. Clamp Diameter: 28.6 – S. H. I. S Lower: EC34 – Crown Race: 30.0 defined colour: Black colour: Black – Stack Height: 28 mm – Bearing Type: Black Oxide Sealed – Material: al 6061 OEM Packing. – Weight: 117 G (with top cap and starnut) Content: 1 set/pack