The D3 Dental Sectional Matrix System Set is a high-precision tool. This complete set includes 50 M4 3.0 stainless steel matrix bands + R7 NiTi clamping ring. M4 3.0 stainless steel matrix bands sizes 3.5mm for deciduous teeth, 4.5mm for bicuspids, 5.5mm for molars, and 6.5mm for extended molars and one reusable R7 NiTi clamping ring with an orange anti-slip grip. Its large-arc design ensures stable tooth wrapping and even material distribution, while the perforated band design simplifies handling. The ring's foot securely extends into the undercut area to prevent slippage.  .