Dental Sectional Matrix System Autoclavale R5 1.0 Nickel Titanium Dental Matrices Clamp Clip Ring Matrix Bands Dentist Tools. Material: Nickel Titanium Dental Matrices Clamp Clip Ring. 【Difference】R5 nickel-titanium clamping ring has two colors, blue: the height is 0.19in, suitable for molars and low crowns;.