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 Yachtmaster 40mm, Submariner (except 14060), Submariner Ceramic, Explorer I 39 mm (2010), Explorer II 40 mm, GMT-Master I & II (non-ceramic) and Oyster Perpetual 39m