Rubber strap, black Accordion type Lug width 24mm Buckle width 22mm Please refer to the photos for the size. The base of the strap is thick, so I think it's recommended for thick watches (like Panerai). Spring bars are included. Although it is new and unused, please note that there may be some scratches or oil. The accordion type is comfortable because it reduces the burden on the wrist due to its moderate elasticity. #erikarin's listed straps Color...Black