Features: 1.Used for polishing tooth adjacent surface after a variety of dental filling materials 2.The abrasive strips are made of flexible polyester,can fit closely with the pressing surface to maximize polishing effect. 3.The Tooth sandpaper is overall lightweight and ultra-thin,can easily inserted into the interdental space. 4.Each dental strips abrasive is 4mm width 6M length,cut the appropriate lenth according your requirments. 5.Yellow is fine sand, Green is Medium sand,purple is Coarse sand . Please purchase according to your actual needs. Specifications : width:4mm Length: 6M Fine:Yellow20um Medium:Green 30um Coarse: Purple 50um Package Include: 1*Dental Polishing Strips