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CRAFTER BLUE CB03 curved end rubber band replacement for Seiko MM300. The rubber band is made of pure vulcanized rubber which has superior strength and more resistant than natural rubber to oils and acids. Material has also met the RoHS requirements and rarely causes severe allergic reaction. It also includes a pair of replacement spring bars for easy installation. Item no. : CB03 Brand Name: CRAFTER BLUE Lug width: 20mm Buckle size: 18mm Buckle Include : No Buckle type / Finish : (Compatible with 18mm Seiko MM300 buckle) Overall Length: 90mm + 55mm (Strap length:145mm / 5.71") Thickness: Approx. 4.5mm - 3.5mm Spring bar hole dia.: 2.50mm Compatible with: MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021 (SLA019J1) and SBDX023 (SLA021J1), SBDX025, SLA023J1 Material: NBR Rubber Color / Finish: Black, Brown, Orange Lug end style: Curved End