Sectional Matrix Bands M4 2.0. Matrix Bands M4 2.0 3.5mm: Deciduous, 0.038mm, snapping back, non-stick coating. Matrix Bands M4 2.0 4.5mm: Premolar, 0.038mm, snapping back, non-stick coating. Matrix Bands M4 2.0 5.5mm: Molar, 0.038mm, snapping back, non-stick coating.
eBay