To give a sporty and chic look to your watch, Briston offers this Sport black interchangeable leather and canvas strap. In calfskin, it is fully adjustable with a notch system that offers better comfort on the wrist.REFERENCE NLS20.B MATERIAL Calfskin leather and canvas COLOR Black BUCKLE Stainless steel ardillon BUCKLE COLOR Silver or matt black (PVD treatment) INTERCHANGEABLE Yes LENGTH 235 mm WIDTH 20 mm