Buckles:Material: Nickel free zinc alloyColor: Matte silverDesign: RollerDimensions: 2 1/8 inches wide by 2 3/8 inches longStraps:Material: Faux leather/manmade materialsColor: One in Chocolate Brown; one in Charcoal BlackSheen: MediumWidth: 1 1/2 inches wideSizes available: 30, 32, 34, 36, 38, and 42 inchesWhat size nickel free belt should you order?Need only the black nickel free belt? Or maybe just the brown nickel free belt? Each belt is available separately, too!Nickel Smart belts are certified nickel-free! The finish and base metal are nickel-free guaranteed never to test positive for nickel. Your total Satisfaction is Guaranteed! We know you will love it, we do!