This watch strap is perfect for those who love high - intensity outdoor activities or need to switch between different styles quickly. Whether you're at the gym or in a meeting, it's a great choice. It's made of FKM rubber, which is durable and can handle tough conditions. The overall length is 125/78mm and the thickness is about 3.5mm. It has a polished or brushed 316L stainless steel black pin buckle. The quick - release spring bars let you change the strap in less than 2 seconds without any tools.