DescriptionMaterial : SteelSize : with 1pcs matriceModel Number : wide/narrowPacking List:Total 10PcsAvailable Color:Blue-wide:6mm,for big teethGreen-narrow:4.5mm,for small teethFeatures:Disposable.Super Good QualityHow to use:Clockwise to tight it arrond tooth.Anti-Clockwire to loose the band.Advantage:Matrix-Profect system is the next generation matrix band engineered to save valuablepreparation time. The sophisticated design allows easier placement andimproved visibility. Single-use to prevent cross-contamination.Pre-assembled with a sliding ban deflector and smooth tightening mechanism.