The standard 22mm PU-strap (polyurethane) from the SBBN017 (Tuna). It is more flexible than the SKX007 strap, but certainly not so soft as the silicon strap of the new Turtles. It already has been shaped for the wrist a bit, the keeper is made of stainless steel and the polyurethane does not attract dust particles. It is 22mm wide between te lugs, the “shoulders” against the case are 24mm and the strap tapers to 20mm at the buckle.
