This watch strap is perfect for Omega Seamaster Diver 300M owners who lead an active lifestyle. Whether you're diving, working out, or just going about your daily routine, it'll be your reliable companion. It's made of premium liquid silicone rubber with a heavy - duty 316L stainless steel buckle. As for the size, it's designed to fit the Omega Seamaster Diver 300M precisely, but no specific weight is mentioned as it focuses more on comfort and style.