Rubber B tang buckle series rubber strap with new MeshMatic flex channel that provides the ultimate level of micro-adjustibility, so the strap is never too tight or too loose.
For Rolex Sea Dweller (non Ceramic), Sea Dweller 4000 (Ceramic), GMT Master II (Ceramic) and Daytona on Oyster bracelet.
(Also fit's Omega Speedmaster Professional and Seamaster 300 models, IWC MkXVII and the MoonSwatch)