This Rollball watch band with a curved solid end pieces perfectly fit Seiko Scuba Diver SKX007, SKX009 and SKX011 models. The new "Rollball" Rally Sports Bracelet was inspired by the arcade game Skee-Ball and anchored by Seiko Chronograph watch. Unlike traditional rally bangles, this high-end Rollball has precise adjustable links details almost invisible. The bracelet features in Rally racing style holes to improve ventilation. Increased thickness and mild blending curved let the Rollball roll along your wrist comfortably. You can now get the look of vintage Seiko 6139-8020 Chronograph for your watch simply mods your watchband into an upgraded Rollball bracelet. The lug of this watch band was tapered into 18mm buckle size, added value on flexibility of using your original 18mm Seiko clasp back if you want. This item includes one pair of FAT spring bar (Generic Seiko Dia. 2.5mm spring bar) to ensure a more secure connection. Here introduce the latest technology of metal coating - "Diamond-like carbon" DLC coating. DLC is very resistant to abrasive and adhesive wear making it suitable for use in wristwatch accessories that may experience extreme contact pressure in rolling or sliding contact. The extreme hardness, wear-resistance, and slickness of DLC coating make it an ideal coating to apply to stainless steel watch bands. Accompany with V-Clasp double lock buttoned diver's clasp. V-Clasp was made from solid 316L stainless steel with extra 6 micro holes for flexible fine tune length adjustment. Featured in V shape safety lock, streamlined form & chamfer edged design to giving a more massive look. Chamfer double locks diver's buckle is ideal for watch band with thickness approximate 4.0 - 5.0mm thickness. Rollball is a must-have replacement band of your Seiko SKX007, SKX009, and SKX011 models.