DT Swiss Ratchet Freehub Body - Shimano Micro Spline, Sealed bearing, Kit w/ End Cap 12 x 142/148mm: 

Ratchet freehub bodies have a gloss finish and don't have a seal, as this is fixed on the hub shell. The Ratchet System was the first of this type for DT Swiss; used in the mid-range products like the 350 hubs.